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US 5,936,480 AGranted
Selective loading for sideband noise ratio reduction of a voltage controlled oscillator
AssigneeMotorola, Inc.
InventorChee Khon Chong
Life of this patent
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Abstract
A voltage controlled oscillator (1) comprising a voltage controllable variable resonant circuit (2) having a control input (Vctrl), a positive feedback input (6) and a controllable variable frequency output (7). There is an amplifier (3) having an amplifier input coupled to the controllable variable frequency output (7). A positive feedback path (4) couples the amplifier (3) to the positive feedback input (6) and there is selectable load (5) in parallel with the positive feedback path (4) for selectively reducing the SideBand Noise Ratio.
Claims9
A voltage controlled oscillator comprising:
- a voltage controllable variable resonant circuit having a control input, a positive feedback input and a controllable variable frequency output;
- an amplifier having an amplifier input coupled to said controllable variable frequency output, a positive feedback node and an oscillator output;
- a positive feedback path coupling said positive feedback node to said a positive feedback input;
- a selectable load coupled to said amplifier, said selectable load being in parallel with said positive feedback path;
- and
- wherein said selectable load has a controllable switch coupled to a current saving mode input coupled to a controller.
3 more elements
A voltage controlled oscillator comprising:
- a voltage controllable variable resonant circuit having a control input, a positive feedback input and a controllable variable frequency output;
- an amplifier having an amplifier input coupled to said controllable variable frequency output, a positive feedback node and an oscillator output:
- a positive feedback path coupling said positive feedback node to said positive feedback input:
- a selectable load having a controllable switch, said selectable load coupled to said amplifier and in parallel with said positive feedback path;
- and
- wherein in use a controller provides a switching signal dependent upon a Radio Frequency interference threshold level or noise threshold level.
3 more elements
Dependencies are inferred from the claim text.