Temperature and/or voltage independent voltage controlled oscillator with programmable gain and/or output frequency range
View Patent ↗An apparatus comprising a transconductance control circuit, a boost control circuit, a current computation circuit and an oscillator circuit. The transconductance control circuit may be configured to generate a current control signal in response to (i) a voltage control signal and (ii) a plurality of range control signals. The boost control circuit may be configured to generate a current boost signal in response to a reference current signal and an enable signal. The current computation circuit may be configured to generate a first control signal and a second control signal in response to the current boost signal and the current control signal. The oscillator circuit may be configured to generate an output signal oscillating at a particular frequency in response to the first control signal and the second control signal.
1. An apparatus comprising:
a transconductance control circuit configured to generate a current control signal in response to (i) a voltage control signal and (ii) a plurality of range control signals;
a boost control circuit configured to generate a current boost signal in response to a reference current signal and an enable signal;
a current computation circuit configured to generate a first control signal and a second control signal in response to said current boost signal and said current control signal; and
an oscillator circuit configured to generate an output signal oscillating at a particular frequency in response to said first control signal and said second control signal.
2. The apparatus according to claim 1 , wherein said transconductance control circuit is further configured to generate a second current control signal as a multiple of said current control signal.
3. The apparatus according to claim 1 , wherein said boost control circuit is further configured to generate a second current boost signal as a multiple of said current boost signal.
4. The apparatus according to claim 1 , wherein said transconductance control circuit includes a low-swing cascode mirror.
5. The apparatus according to claim 1 , wherein said boost control circuit includes a boost current mirror circuit.
6. The apparatus according to claim 1 , wherein said oscillator circuit includes a current controlled oscillator.
7. The apparatus according to claim 1 , wherein said boost control circuit comprises a plurality of CMOS devices.
8. The apparatus according to claim 1 , wherein said frequency of oscillation of said output signal is independent of voltage and temperature variations.
9. The apparatus according to claim 1 , wherein a duty cycle of oscillation of said output signal is independent of voltage and temperature variations.
10. An apparatus comprising:
means for generating a current control signal in response to (i) a voltage control signal and (ii) a plurality of range control signals;
means for generating a current boost signal in response to a reference current signal and an enable signal;
means for generating a first control signal and a second control signal in response to said current boost signal and said current control signal; and
means for generating an output signal oscillating at a particular frequency in response to said first control signal and said second control signal.
11. A method for implementing a voltage controlled oscillator comprising the steps of:
(A) implementing a transconductance control circuit configured to generate a current control signal in response to (i) a voltage control signal and (ii) a plurality of range control signals;
(B) implementing a boost control circuit configured to generate a current boost signal in response to a reference current signal and an enable signal;
(C) implementing a current computation circuit configured to generate a first control signal and a second control signal in response to said current boost signal and said current control signal; and
(D) implementing an oscillator circuit configured to generate an output signal oscillating at a particular frequency in response to said first control signal and said second control signal.