JUPITER CDMA and FM (AMPS) I/Q Filter Preliminary Information DS4724 - 3.1 May 1998 The JUPITER circuit is designed for use in dual band and dual mode mobile phones (CDMA/AMPS) and meets the requirements for IS-95 when used with other chips from Mitel that form the Planet chipset. JUPITER is an active filter incorporating circuits for receiving both CDMA and FM (AMPS). Q_OC_TEST Q_OC_TESTB QIN QINB Q_OFFSET Q_OFFSETB VTEST RTUNE ITUNE QTUNE QBAL QOUT QOUTB VCC FEATURES ■ Low Power and Low Voltage Operation with a Sleep Mode ■ Integrated CDMA and FM Filter with Wide Dynamic Range ■ Low Inband Gain Ripple Performance and Good I/Q Matching for the Filter ABSOLUTE MAXIMUM RATINGS 1 28 2 27 3 26 4 25 5 24 23 6 7 8 I_OC_TEST I_OC_TESTB IIN IINB I_OFFSET I_OFFSETB VEE MODE_CDMA ENABLE ENTEST VREF IOUT IOUTB VEE2 JUPITER 22 21 9 20 10 19 11 18 12 17 13 16 14 15 NP28 20·7V to 15·3V Supply voltage, VCC MAX 230°C to170°C Operating temperature, TOP (at pins) 240°C to 1150°C Storage temperature, TSTG (ambient) 230°C to 1125°C Junction temperature VCC10·6V (Max.) CMOS input logic high, VIH CMOS input logic low, VIL 20·6V (Min.) 20·6V to VCC MAX10·6V Maximum input voltage at all pins Fig. 1 Pin connections - top view ESD PROTECTION All pins are protected against electrostatic discharge to both supplies. At least 2kV protection is provided to MIL-STD-883D Method 3015.7 (human body model). ORDERING INFORMATION JUPITER-1/KG/NP1S I CHANNEL IIN MODE SELECT INPUTS IOUT MODE CONTROL FILTER CONTROL TUNE CONTROLS GAIN CONTROL QIN VGC QBAL QOUT Q CHANNEL Fig. 2 Simplified block diagram JUPITER CIRCUIT DESCRIPTION The block diagram of the JUPITER filter is shown in Fig. 3. Two tunable active low-pass gyrator filters are designed with balanced I/Q inputs and outputs. CDMA MODE In CDMA mode the filter (F1 on Fig. 3) is a 7th order 0.1dB ripple continuously tunable elliptic type with the corner frequency tuned to 690kHz for best stop band attenuation and minimal phase error (in the overall system). Variable gain stages after the filter provide the gain control capability. Overall, each of the CDMA I/Q channels has 45dB nominal voltage gain with the Q channel having ±2dB gain adjustment range. Separate I/Q frequency tuning functions are built into the device. FM MODE In FM mode the same filter is used; however, the biasing is designed such that the current density in the transconductor cells is reduced by a factor of 46, changing the filter’s cutoff frequency to 15kHz. The filter characteristic of the main channel filter (gyrator filter) remains the same, i.e. a 0.1dB 7th order elliptic. In FM mode additional 2nd order Sallen and Key 0.1dB ripple Chebeyshev filters (F2) are included in the signal path prior to the gyrators. These improve the out-of-band blocking of the overall filter. Different amplifiers are used in FM mode to those used in CDMA mode to enable optimization of the gain distribution in FM mode for current consumption and dynamic range. OPERATION Signal inputs are DC coupled in both CDMA and FM modes. The device modes are selected by CMOS compatible logic signals as shown in Table 2. An external resistor should be connected between RTUNE and ground to set internal currents; a resistor with a tolerance of 65% and a temperature coefficient of less than 100ppm is recommended. VREF (pin 18) should be decoupled to VCC to give optimum supply rejection. A test mode is provided for filter calibration. In this mode, a test signal is applied to the VTEST input (pin 7) with ENTEST held high. The test mode is designed to interface with the PLUTO baseband processor, which can provide the test signal and I/QTUNE voltages and calibrates the filters using an internal auto calibration algorithm. The algorithm generates two test frequencies and calibrates the filters to give the correct attenuation at the upper frequency. The calibration is normally carried out in CDMA mode: the FM filter performance is scaled accordingly. Pins are provided for DC offset control for I and Q channels (I_OFFSET, I_OFFSETB, Q_OFFSET and Q_OFFSETB). In typical operation, the I_OFFSET/Q_OFFSET pins would be controlled by a voltage derived from the baseband processor. However, it is also possible to minimise the DC offset using external components; this is primarily intended for test purposes. These feedback components between IOUT/QOUT and I_OFFSET/Q_OFFSET are shown in Fig. 4 but would not be used in the normal application In test mode, these offset controls are disabled and the offsets are controlled using on-chip feedback. The loop filter for this feedback uses external 10nF capacitors on pins I_OC_TEST/B and Q_OC_TEST/B as shown in Fig. 4. Pin Name I/O Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Q_OC_TEST Q_OC_TESTB QIN QINB Q_OFFSET Q_OFFSETB VTEST RTUNE ITUNE QTUNE QBAL QOUT QOUTB VCC VEE2 IOUTB IOUT VREF ENTEST ENABLE MODE_CDMA VEE I_OFFSETB I_OFFSET IINB IIN I_OC_TESTB I_OC_TEST I I I I I I I Q channel offset control in test mode Q channel offset control in test mode (balanced) Q channel CDMA/FM input. Q channel CDMA/FM input (balanced) Q channel offset control Q channel offset control (high gain mode) Test mode signal input for tuning operation Precision resistor for current definition (18k) I filter tuning control Q filter tuning control Q channel gain adjust voltage, VGC Q channel CDMA/FM output Q channel CDMA/FM output (balanced) Supply Ground I channel CDMA (balanced) I channel CDMA Reference voltage decouple Mode control (see Table 2) Mode control (see Table 2) Mode control (see Table 2) Ground (substrate) I channel offset control (high gain mode) I channel offset control I channel CDMA (balanced) I channel CDMA I channel offset control in test mode (balanced) I channel offset control in test mode I I I O O P P O O I I I P I I I I I I Table 1 Pin descriptions 2 JUPITER Q_OFFSET Q_OFFSETB Q_OC_TEST Q_OC_TESTB 1 2 5 50k gm 6 gm VGC Q CHANNEL ± 2dB QIN QINB ENTEST ENABLE MODE_CDMA VTEST IIN IINB gm 3 12 ATTENUATOR 4 X1 gm 13 F1 10 19 20 21 MODE CONTROL FILTER CONTROL 7 8 9 F1 26 ATTENUATOR 25 17 gm X1 16 15 22 gm 14 F3 F2 QTUNE RTUNE ITUNE 18 IOUT IOUTB VEE2 VEE VCC VREF 50k 24 23 QOUT QOUTB gm -0·1 dB I_OFFSET I_OFFSETB QBAL F3 F2 -0·1 dB 11 gm gm 28 I_OC_TEST 27 I_OC_TESTB Fig. 3 Block diagram Description Sleep mode CDMA mode FM mode CDMA filter testmode FM filter test mode Disallowed mode ENABLE 0 1 1 1 1 0 MODE_ ENTEST CDMA X 1 0 1 0 X 1 0 0 1 1 0 Comments All circuits powered down Biasing and CDMA signal path on Biasing and FM signal path on Biasing, CDMA test and CDMA signal path on, excluding input amplifier Biasing, FM test and FM signal path on, excluding input amplifier. This is functionally the same as sleep mode but has higher ICC. In sleep mode PLUTO applies a logic high to ENTEST Table 2 Truth table for mode control lines 3 JUPITER ELECTRICAL CHARACTERISTICS The Electrical Characteristics are guaranteed over the following range of operating conditions unless otherwise stated (see Fig. 4 for test circuit): TAMB = 2 30°C to 170°C, VCC = 3V 10·6V/20·3V DC Characteristics Value Characteristic General Supply voltage, VCC Operating temperature, TAMB Tune/Gain Control Lines DC level Input impedances: QBAL, ITUNE and QTUNE I_OFFSET/B and Q_OFFSET/B I/O DC Voltages Inputs IIN/B and QIN/B Outputs IOUT/B and QOUT/B 4 Conditions Typ. Max. 2·7 230 3·0 3·6 170 V °C 0·15 5·2 11·0 mA mA mA µs QBAL = ITUNE = QTUNE <0·5V QBAL = ITUNE = QTUNE = 1·2V QBAL = ITUNE = QTUNE = 1·2V ICC reduced to 10% of active value 2·0 20·1 220 220 VCC10·1 0·5 20 20 V V µA µA % 0·5 2·0 V Supply Current, ICC Sleep mode FM mode CDMA mode Turn off time, CDMA/FM mode to Sleep mode Mode Control Lines (CMOS) Input logic high, VIH Input logic low, VIL Input high current IIH Input low current, IIL Units Min. 3·4 7·3 100 kΩ kΩ 200 500 VCC20·6 VCC21·6 VCC20·4 VCC21·4 VCC20·2 VCC21·2 V V All logic inputs Referenced to on-chip ref. voltage (1·2V) JUPITER ELECTRICAL CHARACTERISTICS FM Mode AC Characteristics All parameters are defined as differential unless otherwise stated Value Characteristic Min. Typ. 10 Maximum input frequency Gain Characteristics I voltage gain (AV) IIN/B to IOUT/B Q voltage gain QIN/B to QOUT/B Q channel gain adjust Q channel gain control Gain variation over temperature and supply voltage Differential output amplitude balance, QOUT/QOUTB, IOUT/IOUTB 39 AV21·5 62 41 4·0 20·75 Power Supply Rejection In-band Out of band 10 0 Noise Input referred 30 1dB Compression Output 1dB compression Out of band blocking signal causing 1dB compression of in-band signal Blocking signal at 60kHz 1·5 43 AV11·5 8·0 10·75 60·25 dB 45 1·9 Filter Characteristic (Note 1) 3dB pass band Stop band attenuation 45kHz Stop band attenuation 60kHz to 10MHz I and Q bandwidth matching In-band gain ripple Group delay variation Average phase balance, I and Q channels Offset Loop Correction Filter offset adjustment gain: I_OFFSET/Q_OFFSET I_OFFSET B/Q_OFFSETB Amplifier offset settling time: After power on After CDMA to FM cycling Input Impedances QIN/QINB and IN/INB Bandwidth = 10Hz to 5MHz. I and Q channels Frequency = 2kHz 2101 8·8 dBV µVrms Unmodulated interferers 60kHz 75mVrms, 120kHz 7·5mVrms kHz dB dB % dBp-p µs deg ITUNE = QTUNE = 1·2V 16·5 63 70 19·5 10 1·0 10 1·4 4·0 Output Impedances QOUT/QOUTB and IOUT/IOUTB µVrms 380 30 8·0 Measured at I/Q output frequency = 10kHz Measured at I/Q output frequency = 630kHz In-band frequency = 2kHz. All conditions 27°C only In-band frequency = 2kHz. All conditions 27°C only 5 1·0 0·6 VCC = 6150mV mVrms mVrms mVrms mVrms 266 14·5 48 60 External load = 50kΩ//5pF QBAL = 1·2V QBAL = 0·5 to 2V dB dB Vp-p 266 Intermodulation Input referred intermodulation product MHz dB dB dB/V dB 380 Blocking signal at 120kHz Conditions Units Max. 10 1·0 % Frequency = 100Hz to 12·2kHz V/V V/V 4·0 ms ms Settling to within 5mV Settling to within 5mV 12 kΩ Frequency = 2kHz kΩ Frequency = 2kHz NOTE 1. Filter tuned in CDMA mode to 28dB at 720kHz 5 JUPITER ELECTRICAL CHARACTERISTICS CDMA Mode AC Characteristics All parameters are defined as differential unless otherwise stated Value Characteristic Min. Typ. Maximum input frequency Gain Characteristics I voltage gain (AV) IIN/B to IOUT/B Q voltage gain QIN/B to QOUT/B Q channel gain adjust Q channel gain control Gain variation over temperature and supply voltage Differential output amplitude balance, QOUT/QOUTB, IOUT/IOUTB 10 43 AV21·5 62 45 4·0 20·75 47 AV11·5 MHz 8·0 10·75 dB dB dB/V dB 60·25 dB External load = 50kΩ//5pF QBAL = 1·2V QBAL = 0·5 to 2V VCC = 6150mV Power Supply Rejection In-band 20 dB Measured at I/Q output frequency = 690kHz Noise Input referred 110 µVrms Bandwidth = 10Hz to 5MHz. I and Q channels 1·9 Vp-p 1dB Compression Output 1dB compression Out of band blocking signal causing 1dB compression of in-band signal Blocking signal at 60kHz 1·5 110 150 Blocking signal at 120kHz 110 150 Intermodulation Input referred intermodulation product 284·8 57 2101 8·8 284·8 57 Input referred intermodulation product 2101 8·8 Filter Characteristic (Note 1) ITUNE/QTUNE voltage Pass band variation over supply and temperature variation I/Q tuning gain Stop band attenuation 900kHz to 10MHz I and Q bandwidth matching In-band gain ripple Average phase balance, I and Q channels Frequency = 2kHz mVrms mVrms mVrms mVrms In-band frequency = 100kHz. All conditions 27°C only In-band frequency = 100kHz. All conditions 27°C only dBV µVrms dBV µVrms dBV µVrms dBV µVrms Unmodulated interferers 900kHz 24mVrms, 1700kHz 15mVrms 27°C only 0·5 1·2 2·0 V 23 0 13 % 50 240 55 4 1·0 3 kHz/V dB % dBp-p deg NOTE 1. Filter tuned to 28dB at 720kHz relative to 350kHz 6 Conditions Units Max. Unmodulated interferers 1·25MHz 24mVrms, 2·25MHz 15mVrms 27°C only Tuning voltage to set filter to 28dB at 720kHz relative to 350kHz VCC = 6150mV ITUNE = QTUNE = 1·2V Frequency = 1kHz to 630kHz Frequency = 1kHz to 630kHz Cont… JUPITER ELECTRICAL CHARACTERISTICS CDMA Mode AC Characteristics (continued) Value Characteristic Offset Loop Correction Filter offset adjustment gain: I_OFFSET/Q_OFFSET I_OFFSET B/Q_OFFSETB Amplifier offset settling time: After power on After FM to CDMA cycling Input Impedances QIN/QINB and IN/INB Units Typ. Max. 1·2 2·0 2·0 2·8 V/V V/V 10 4·0 ms ms Settling to within 6mV Settling to within 6mV 12 kΩ Frequency = 2kHz kΩ Frequency = 2kHz 8·0 10 Output Impedances QOUT/QOUTB and IOUT/IOUTB 1·0 VCC Conditions Min. QBAL VTEST EN_TEST ENABLE MODE_CDMA QTUNE ITUNE QIN IIN QIN IIN QINB IINB Q_OFFSET 10n I_OFFSET 100n 100n Q_OFFSETB VCC I_OFFSETB JUPITER Q_OC_TEST 100k 100k 10n VCC I_OC_TEST 10n 10n Q_OC_TESTB 100k 100k I_OC_TESTB QOUT IOUT QOUT IOUT QOUTB IOUTB RTUNE VEE VEE2 VREF VCC 220n 18k 1n 100n Fig. 4 Test circuit 7 http://www.mitelsemi.com World Headquarters - Canada Tel: +1 (613) 592 2122 Fax: +1 (613) 592 6909 North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. 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