Mini Twin Transistor Devices Function in VCO Applications
Wed, 02/25/2009 - 10:46am
California Eastern Labs introduces the UPA828TD Twin Transistor from NEC for shrinking VCO designs. The unit combines two closely-matched silicon NPN chips in a miniature 1.2 ×1 × 0.5 mm 6-pin leadless RoHS-compliant package. Suitable for VCO applications, the transistor enables oscillator and buffer amplifier functions to be combined in one miniature device. Its small size and very low power consumption make it appropriate for portable, battery-powered products. Typical specifications at 1 V, 3 mA, 2 GHz include a noise figure of 1.3 dB and frequency fT of 9 GHz. The chip inside the unit is NEC's NE687 for which non-linear models can be found on the CEL Web site. Each transistor is independently mounted, so the device can be configured for either cascode or dual transistor operation.