| 摘要 |
Problems associated with compromise, fixed base or gate inductances (16) in negative resistance oscillators (10) are overcome by use of an electronically tunable base network. Parameters such as phase noise and output power can thereby be optimized over a wide range of operating conditions. The disclosure is illustrated with reference to a 500 - 1300 Mhz voltage controlled oscillator employing base-tuning varactors (43a, 43b) that are slaved (44) to the VCO's tuning signal (30). A transform network 44 optionally provided may include a resistor network, active devices or a ROM look-up table. In an alternative arrangement, the base tune signal is not linked to the frequency control signal and the varactors are connected in parallel with the base connected inductor. <IMAGE>
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