TOC Tuning Varactors FREQUENCY LINEAR TUNING VARACTORS suitable circuits, with no need for external linearization. The combination of high Q and low surface noise results in low FM noise in VCO applications. They are particularly useful in modulated VCO’s because of their constant sensitivity, and high modulation rate capability. DESCRIPTION A Frequency Linear Tuning Varactor (FLTVAR)TM is a silicon epitaxial mesa device, designed to provide wideband Linear Tuning in VCO and filter applications. ELECTRICAL SPECIFICATIONS: TA=25°C These diodes feature thermal oxide passivation for high reliability, low leakage current, and very low surface noise. They offer Q values well above ion-implanted hyperabrupt diodes. The specifications below apply to chips, or to chips mounted on carriers. Although these chips can be provided in any of our standard packages, this is not recommended for the lower capacitance diodes, because the parallel parasitic capacitance of the package degrades linearity at high bias voltages. APPLICATIONS The GC15000 series of frequency-linear tuning varactors are used in VCO’s, filters, amplifiers and modulators for wide band tuning through Ku band. The frequency linear characteristics allow over one octave linear tuning in MODEL NUMBER JUNCTIO N1 CAPACIT ANCE CJ-4 (pF) GC15001 GC15002 GC15003 GC15004 GC15005 GC15014 GC15015 GC15016 GC15006 GC15007 GC15008 GC15009 GC15010 GC15011 GC15012 GC15013 SENSITIV ITY2 TYP QUALITY FACTOR3 TYP 0.7 1.0 2.0 5.0 10.0 22.0 33.0 48.0 0.7 1.0 2.0 5.0 10.0 22.0 33.0 48.0 NOTES: 1. Other capacitance values are available; consult factory. 2. Other S values and tuning ranges can be developed. 3. V=4 V, 50 MHz 4. Sensitivity series, S = .08; V = 15 volts. Sensitivity series, S = . 11; V = 20 volts. Typical Performance TUNING RATION4 CJ0 / CJV TYP .08 .08 .08 .08 .08 .08 .08 .08 .11 .11 .11 .11 .11 .11 .11 .11 1500 1450 1400 1300 900 600 475 400 900 875 850 825 800 600 475 400 6:1 6:1 6:1 6:1 6:1 6:1 6:1 6:1 11:1 11:1 11:1 11:1 11:1 11:1 11:1 11:1 RATINGS Minimum Voltage Breakdown: Maximum Leakage Current: Capacitance Tolerance: Operating Temperature: Storage Temperature: 22 volts at 10µA max 50 nA at 20 volts, 25°C ±10% at -4 volts1 -55ºC to +150ºC -65ºC to +200ºC SEMICONDUCTOR OPERATION 75 Technology Drive Lowell, MA 01851 Tel: 978-442-5600 Fax: 978-937-3748 35 TOC Tuning Varactors FREQUENCY LINEAR TUNING VARACTORS Frequency vs Reverse Voltage in Single Stage L-C Circuit Typical Capacitance vs Reverse Voltage SEMICONDUCTOR OPERATION 75 Technology Drive Lowell, MA 01851 Tel: 978-442-5600 Fax: 978-937-3748 36