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2010-12-01T18:13:29+01:00
2010-10-25T02:30:08+01:00
2010-12-01T18:13:29+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0495573-A2-19920722
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EP-0495573-A2-19920722
The present invention provides a high frequency CMOS voltage controlled oscillator circuit with gain constant and duty cycle compensation. The voltage controlled oscillator circuit includes a multi-stage ring oscillator that includes a plurality of series-connected inverter stages comprising N-channel and P-channel transistors. The ring oscillator responds to a control current signal for controlling the frequency of oscillation of the ring oscillator. A voltage-to-current converter converts a tuning voltage input signal to a corresponding output current signal that is independent of the channel strength of the N-channel and P-channel transistors. Process compensation circuitry responds to the tuning voltage input signal to provide a current dump output signal corresponding to the channel strength of the P-channel and N-channel transistors. Trip-point compensation circuit provides a net ring current signal as the current control signal to the ring oscillator. The net ring current signal represents the difference between the output current signal and the current dump output signal and responds to the balance between the output buffer trip point and a ring oscillator dummy stage.
The present invention provides a high frequency CMOS voltage controlled oscillator circuit with gain constant and duty cycle compensation. The voltage controlled oscillator circuit includes a multi-stage ring oscillator that includes a plurality of series-connected inverter stages comprising N-channel and P-channel transistors. The ring oscillator responds to a control current signal for controlling the frequency of oscillation of the ring oscillator. A voltage-to-current converter converts a tuning voltage input signal to a corresponding output current signal that is independent of the channel strength of the N-channel and P-channel transistors. Process compensation circuitry responds to the tuning voltage input signal to provide a current dump output signal corresponding to the channel strength of the P-channel and N-channel transistors. Trip-point compensation circuit provides a net ring current signal as the current control signal to the ring oscillator. The net ring current signal represents the difference between the output current signal and the current dump output signal and responds to the balance between the output buffer trip point and a ring oscillator dummy stage.
en
European Patent Office
EP0495573
EP 0495573
H03K 03/03
CMOS voltage controlled oscillator
CMOS voltage controlled oscillator - European Patent Office - EP 0495573 A2
CMOS voltage controlled oscillator - European Patent Office - EP 0495573 A2
Adobe PDF Library 8.0
"EP0495573"; "EP 0495573"; "H03K 03/03"; "CMOS voltage controlled oscillator"
1.4
1
B
13
EP
0495573
A2
1992-07-22
92300100
1992-01-07
US
642677
1991-01-17
H03K 03/03
NATIONAL SEMICONDUCTOR CORPORATION
Rasmussen, Richard R.
Horton, Andrew Robert Grant et al
CMOS voltage controlled oscillator
Spannungsgesteuerter CMOS-Oszillator
CMOS voltage controlled oscillator
Oscillateur contrôlé en tension de type CMOS
The present invention provides a high frequency CMOS voltage controlled oscillator circuit with gain constant and duty cycle compensation. The voltage controlled oscillator circuit includes a multi-stage ring oscillator that includes a plurality of series-connected inverter stages comprising N-channel and P-channel transistors. The ring oscillator responds to a control current signal for controlling the frequency of oscillation of the ring oscillator. A voltage-to-current converter converts a tuning voltage input signal to a corresponding output current signal that is independent of the channel strength of the N-channel and P-channel transistors. Process compensation circuitry responds to the tuning voltage input signal to provide a current dump output signal corresponding to the channel strength of the P-channel and N-channel transistors. Trip-point compensation circuit provides a net ring current signal as the current control signal to the ring oscillator. The net ring current signal represents the difference between the output current signal and the current dump output signal and responds to the balance between the output buffer trip point and a ring oscillator dummy stage.
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