AN0012 CHA2069QDG 24.5-26.5GHZ CHA2069QDG Recommended external matching network in the 24.5-26.5 GHz band The following is an application note in order to improve the performances of the product for the dedicated 24.5-26.5GHZ frequency band using simple external matching networks. Ref. : AN00126080 - 21 Mar 06 1/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Description The CHA2069QDG is a three-stage self-biased wide band monolithic low noise amplifier. Typical applications range from telecommunication (point to point, point to multi-point, VSAT) to ISM and military markets. The circuit is manufactured with a standard P-HEMT process: 0.25µm gate length, via holes through the substrate, air bridges and electron beam lithography. It is supplied in RoHS compliant SMD package. Main Features ■ Broadband performances : 18-30GHz ■ 3dB noise figure ■ 20dB gain ■ 65mA low DC power consumption ■ 20dBm 3rd order intercept point (high current configuration) ■ Package type : 24 leads QFN4x4. : External matching The 24Leads QFN4x4 is an SMD type package. Therefore, a suitable motherboard environment is chosen. All tests and verifications are performed on Rogers RO4003 (or equivalent). This material exhibits a permittivity of 3.38 and is used with a thickness of 200µm (8 mils) and a 1/2oz or less copper cladding. The corresponding 50 Ohm transmission line has a strip width of about 460µm (approx. 18 mils). When using this circuit in a reduced bandwidth, such as in the 24.5 to 26.5GHz frequency range, the performances of the circuit could be improved using external (on board) matching stubs and slugs. This board pattern is easily computed from the Sij of the package product as given in the data-sheet (and in the section below) with any CAD software, using the material defined above for the motherboard. The following give results obtained at UMS, based on the given motherboard layout. Ref. AN00126080 - 21 Mar 06 2/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Typical Sij for low current configuration (without external matching) Tamb = +25°C, Vd = +4,5V Pads: B,D,E grounded. F (GHz) 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 29 30 31 32 S11 dB -0.1 -0.1 -0.1 -0.2 -0.4 -0.6 -1.2 -1.8 -2.8 -4.0 -5.7 -8.8 -15.8 -17.4 -10.9 -8.5 -7.0 -6.2 -5.8 -4.9 -4.7 -4.3 -3.9 -3.8 -3.3 -3.0 -2.5 -2.5 -2.8 -3.9 -2.8 S11 /° -58.7 -89.3 -123.5 -160.8 156.1 107.6 58.9 13.5 -26.1 -58.0 -89.1 -122.0 -173.9 24.9 -20.6 -47.1 -65.5 -82.8 -98.4 -110.8 -125.9 -138.7 -152.2 -163.2 -173.7 175.5 166.4 155.4 146.3 144.4 154.3 S12 dB -95.2 -68.8 -63.2 -62.9 -58.1 -67.5 -68.1 -61.6 -60.0 -55.1 -53.4 -49.6 -50.5 -48.2 -48.3 -49.6 -47.3 -44.9 -42.5 -43.2 -45.3 -43.3 -43.7 -44.2 -45.4 -46.5 -43.7 -43.2 -42.0 -46.4 -47.9 S12 /° -85.6 63.3 93.4 47.1 11.4 -59.7 93.7 -9.2 -42.6 171.8 87.2 14.1 -42.8 -120.3 171.6 133.4 121.9 92.5 57.3 20.1 14.9 -0.5 -14.8 -36.7 -48.5 -43.8 -45.2 -59.5 -81.7 -112.7 -148.6 S21 dB -57.5 -77.6 -52.9 -37.4 -18.1 -4.4 4.4 9.6 14.7 19.0 21.7 23.3 24.0 23.5 22.4 21.5 20.9 20.8 20.7 20.9 20.9 20.9 20.4 19.6 18.8 17.8 17.1 16.8 17.3 18.0 17.2 S21 /° -2.4 -24.4 62.8 145.3 93.6 28.0 -52.1 -122.4 176.1 109.4 41.3 -24.1 -86.8 -146.2 162.0 116.9 75.8 34.2 -6.5 -48.3 -90.8 -135.3 178.7 135.8 92.8 52.7 13.2 -26.3 -69.6 -123.9 168.4 S22 dB -0.6 -0.9 -0.9 -1.3 -1.7 -2.0 -3.0 -3.9 -4.4 -8.3 -13.4 -17.0 -12.6 -8.3 -6.3 -5.9 -5.9 -6.1 -7.2 -7.9 -9.2 -8.7 -7.6 -6.3 -4.4 -3.7 -3.0 -2.7 -2.7 -2.6 -2.5 Refer to the “definition of the Sij reference planes” section below Ref. AN00126080 - 21 Mar 06 3/12 United Monolithic Semiconductors S.A.S. Route Départementale 128 - B.P.46 - 91401 Orsay Cedex France Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 S22 /° -148.4 157.1 112.4 72.0 39.9 8.4 -20.2 -38.6 -69.5 -92.5 -92.8 -67.1 -36.0 -46.7 -65.3 -85.2 -99.8 -116.0 -130.1 -137.3 -142.4 -139.3 -141.9 -148.5 -156.9 -169.0 -179.9 171.2 161.4 156.1 150.5 24.5-26.5GHz Application Note CHA2069QDG Typical Sij for high current configuration (without external matching) Tamb = +25°C, Vd = +4,5V Pads: B,C,F grounded. F (GHz) 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 29 30 31 32 S11 dB -0.1 -0.1 -0.1 -0.2 -0.4 -0.7 -1.3 -1.8 -2.9 -4.0 -5.6 -8.5 -14.6 -19.5 -11.3 -8.5 -6.9 -6.1 -5.6 -4.6 -4.4 -4.1 -3.7 -3.8 -3.5 -3.3 -3.0 -2.9 -2.9 -3.8 -2.7 S11 /° -58.5 -88.9 -122.6 -159.2 158.4 110.4 60.8 13.6 -27.8 -60.9 -92.1 -123.1 -169.0 26.2 -23.8 -49.1 -67.5 -83.9 -97.1 -109.1 -123.2 -135.7 -149.8 -162.0 -173.4 174.4 164.8 153.8 143.4 138.2 145.3 S12 dB -92.2 -67.1 -62.8 -63.0 -56.6 -64.5 -67.3 -61.5 -59.6 -54.4 -53.9 -50.6 -52.1 -50.3 -49.4 -50.9 -46.9 -44.9 -43.0 -44.1 -45.4 -43.9 -43.4 -44.3 -44.5 -47.4 -44.8 -43.6 -41.7 -44.6 -49.9 S12 /° 81.8 55.2 100.3 51.4 15.4 -49.7 88.2 -7.6 -45.7 176.7 99.3 22.2 -32.8 -120.6 165.3 132.8 122.6 88.3 53.7 21.4 19.8 7.2 -10.0 -34.6 -42.2 -45.9 -39.0 -43.1 -66.2 -91.4 -140.7 S21 dB -57.9 -69.1 -51.5 -37.2 -17.7 -3.8 5.3 10.6 15.6 19.9 22.7 24.2 25.1 24.8 23.6 22.6 21.8 21.5 21.2 21.3 21.3 21.4 21.0 20.3 19.7 18.7 18.0 17.6 18.0 18.4 17.8 S21 /° 0.4 -41.4 77.3 145.1 97.4 31.4 -49.4 -120.9 177.2 110.8 43.0 -22.2 -84.9 -145.6 161.3 115.2 73.8 32.7 -7.8 -48.7 -90.2 -133.4 -178.9 138.4 94.7 53.4 12.8 -27.1 -70.8 -123.8 169.5 S22 dB -0.7 -1.1 -1.0 -1.5 -1.9 -2.2 -3.4 -4.6 -4.8 -8.5 -12.5 -16.3 -13.8 -8.9 -6.5 -6.0 -5.8 -6.1 -7.0 -7.6 -9.0 -9.4 -8.8 -7.6 -5.5 -4.5 -3.6 -3.0 -2.6 -2.6 -2.6 Refer to the “definition of the Sij reference planes” section below Ref. : AN00126080 - 21 Mar 06 4/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 S22 /° -146.6 159.3 114.1 73.0 40.1 8.3 -21.8 -40.0 -68.3 -89.9 -90.4 -76.8 -40.8 -46.4 -65.0 -86.1 -101.6 -119.7 -134.2 -144.5 -153.5 -152.7 -151.9 -155.6 -161.7 -172.3 177.3 168.4 158.1 150.7 144.6 24.5-26.5GHz Application Note CHA2069QDG Definition of the Sij reference planes The reference planes are defined from the footprint of the recommended characterization board 95541 (see data-sheet). The reference is the symmetrical axis of the package. The input and output reference planes are located at 3.18mm offset (input wise and output wise respec.) from this axis. Then, the given Sij incorporates this land pattern. 3.18 Ref. : .AN00126080 - 21 Mar 06 3.18 5/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Proposed Assembly board “95960” for the 24.5-26.5GHz operation - - Compatible with the proposed foot print (see datasheet). Based on typically Ro4003 / 8mils or equivalent. Using a microstrip to coplanar transition to access the package. Recommended for the implementation of this product on a module board. Ref. : AN00126080 - 21 Mar 06 6/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Dimension table for assembly board “95960”. W_out W_in D_in D_out H_in H_out CHA2069 QDG IN OUT Footprint 24.5-26.5GHz D_in (µm) W_in (µm) H_in (µm) D_out (µm) W_out (µm) H_out (µm) 3410 1050 800 3660 800 800 Ref. : .AN00126080 - 21 Mar 06 7/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Typical PCB Measured Performance Tamb = +25°C, Vd = +4,5V Typical S parameters with matching network for the 24,5-26,5GHz band Config. Low current (BDE grounded) Narrow frequency band 25 20 15 S21 Sij (dB) 10 5 0 S11 -5 -10 -15 S22 -20 24.5 25 25.5 26 26.5 Frequency (GHz) Sij using the proposed land pattern and board 95960 with SSMA connectors. Sij in the package access plan Typical S parameters with matching network for the 24,5-26,5GHz band Config. Low current (BDE grounded) Wide frequency range 25 20 15 S21 Sij (dB) 10 5 S11 0 -5 -10 -15 S22 -20 0 5 10 15 20 25 30 Frequency (GHz) Sij using the proposed land pattern and board 95960 with SSMA connectors. Sij in the package access plan Ref. : AN00126080 - 21 Mar 06 8/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Typical PCB Measured Performance Tamb = +25°C, Vd = +4,5V Typical S parameters with matching network for the 24,5-26,5GHz band Config. High current (BCFgrounded) Narrow frequency band 25 20 15 S21 Sij (dB) 10 5 0 S1 S22 -5 -10 -15 -20 24.5 25 25.5 26 26.5 Frequency (GHz) Sij using the proposed land pattern and board 95960 with SSMA connectors. Sij in the package access plan Typical S parameters with matching network for the 24,5-26,5GHz band Config. High current (BCFgrounded) Wide frequency range 25 20 15 S21 Sij (dB) 10 5 S11 0 -5 -10 -15 S22 -20 0 5 10 15 20 25 30 Frequency (GHz) Sij using the proposed land pattern and board 95960 with SSMA connectors. Sij in the package access plan Ref. : .AN00126080 - 21 Mar 06 9/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Typical PCB Measured Performance Tamb = +25°C, Vd = +4,5V Typical Output 1 dB compression with the Matching Network for the 24,5-26,5GHz Band 20 Ouput P1dB (dBm) 18 high current (BCFgrounded) 16 14 12 10 low current (BDE grounded) 8 6 4 2 0 24,5 25 25,5 26 26,5 Frequency (GHz) Output P1dB using the proposed land pattern and board 95960 with SSMA connectors Ref. : AN00126080 - 21 Mar 06 10/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 24.5-26.5GHz Application Note CHA2069QDG Typical PCB Measured Performance Tamb = +25°C, Vd = +4,5V Typical Output IP3 vs Frequency @ Pout/tone=-5 dBm 30 Config. High current (BCF grounded) Output IP3 (dBm) 25 20 Config. low current (BDE grounded) 15 10 5 0 24.5 25 25.5 26 26.5 Frequency (GHz) Output IP3 using the proposed land pattern and board 95960 with SSMA connectors Typical C/I3 vs Pout/tone @ high current configuration (BCF grounded) Typical C/I3 vs Pout/tone @ low current configuration (BDE grounded) 70 70 60 60 50 24.5GHz 40 C/I3 (dB) C/I3 (dB) 50 25GHz 25.5GHz 30 26GHz 20 24.5GHz 40 25GHz 25.5GHz 30 26GHz 26.5GHz 20 26.5GHz 10 10 0 0 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 -10 0 -9 -8 -7 -6 -5 -4 Pout/tone (dBm) Pout/tone (dBm) C/I3 using the proposed land pattern and board 95960 with SSMA connectors Ref. : .AN00126080 - 21 Mar 06 11/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 -3 -2 -1 0 24.5-26.5GHz Application Note CHA2069QDG Typical Electrical Characteristics summary : Low current configuration Tamb = +25°C, Vd = +4,5V Pads: VgB,VgD,VgE=GND Symbol Fop 24.5 – 26.5 Unit GHz Gain 20 dB ∆G Gain flatness ±1 dB NF Noise figure 3.5 dB IS11I Input return loss -8 dB IS22I Ouput return loss -6 dB 3rd order intercept point (Pout/tone=-5dBm) 21 dBm 12.5 dBm 65 mA G IP3 P1dB Parameter Operating frequency range Output power at 1dB gain compression Id Drain bias current High current configuration Tamb = +25°C, Vd = +4,5V Pads: VgB,VgC,VgF=GND Symbol Fop 24.5 – 26.5 Unit GHz Gain 21 dB ∆G Gain flatness ±1 dB NF Noise figure 3.5 dB IS11I Input return loss -10 dB IS22I Ouput return loss -15 dB 3rd order intercept point (Pout/tone=-5dBm) 22 dBm Output power at 1dB gain compression 14 dBm Drain bias current 85 mA G IP3 P1dB Id Parameter Operating frequency range Ref. : AN00126080 - 21 Mar 06 12/12 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09