RF oscillator and modulator having regulated low harmonic output
AssigneeFairchild Camera and Instrument Corporation
InventorWilson E. Alexander
Life of this patent
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Abstract
An RF oscillator and modulator produces a stable moudlated RF signal with a varying voltage source and without the requirement for critical device selection. A bias voltage for the oscillator transistor is provided by diode means at the oscillator output, the bias voltage being commuted to the transistor through the oscillator tuned circuit. Advantageously, the diode means biases a diode modulator connected to the oscillator output and to a modulation signal whereby linear operation of the diode modulator is enhanced.
Claims7
An RF oscillator and modulator wherein said oscillator has a regulated output power for a range of supply voltage and low harmonic voltage output comprising:
- a. a bipolar transistor having emitter, base and collector terminals,
- b. a voltage source,
- c. means connecting said transistor to said voltage source;
- d. means connecting said transistor to circuit ground;
- e. tuned circuit means operably connected with said transistor to establish oscillation frequency;
- f. means interconnecting said tuned circuit means and an oscillator output terminal;
- g. diode biasing means having a fixed DC voltage drop connecting said output terminal and circuit ground whereby said fixed DC voltage is commuted to said transistor through said tuned circuit as a bias voltage and
- h. modulation means connected to said oscillator output terminal for receiving a modulation signal and modulating said oscillator signal.
Dependencies are inferred from the claim text.