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US 2003/0146795 A1Published application
Voltage controlled oscillators
AssigneeZarlink Semiconductor Inc.
InventorsRichard Albon, Nicholas Tingle
Life of this patent
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Abstract
A voltage controlled oscillator (VCO) is provided which comprises: a tank circuit; an amplifier comprising a number of switchable amplifier elements (8, 10, 12); and means for switching each amplifier element (8, 10, 12) on or off depending on the frequency at which the VCO is oscillating, so as to maintain the transconductance of the amplifier elements (8, 10, 12) within certain limits.
Claims10
A voltage controlled oscillator (VCO) comprising:
- a tank circuit;
- an amplifier comprising a number of switchable amplifier elements;
- and
- means for switching each amplifier element on or off depending on the frequency at which the VCO is oscillating, so as to maintain the transconductance of the amplifier elements within certain limits.
1 more element
A voltage controlled oscillator (VCO) comprising:
- an amplifier;
- a tank circuit;
- and
- a variable current supply, arranged to be varied in order to control the current into the tank circuit, so as to reduce variation in the output signal level at different frequencies.
1 more element
Dependencies are inferred from the claim text.