Complementary voltage to current conversion for voltage controll

Details Complementary voltage to current conversion for voltage controll Complementary voltage to current conversion for voltage controll

1996-09-19

1998-01-20

Mis, David

Oscillators

Ring oscillators

331 34, 331143, 331177R, 331185, 327543, H03B 524

Patent

active

057105278

ABSTRACT:
A voltage controlled oscillator has a linear voltage to current characteristic from ground to the supply voltage. This oscillator includes a voltage to current converter which employs two output current paths. The first output current path includes an N-type MOSFET whose gate receives the input voltage. A level shifter circuit receives the input voltage and provides an output voltage shifted up by an amount equal to the input threshold voltage of an N-type MOSFET. A clamp circuit connected to the output of the level shifter circuit prevents this output voltage from becoming greater than a voltage equal to the sum of the input threshold voltage of an N-type MOSFET and the input threshold voltage of a P-type MOSFET. The gate of the second N-type MOSFET receives the output of the level shifter as clamped by the clamp circuit. A current mirror circuit supplies a current control to ring oscillator, whose frequency depends upon the current. A second embodiment includes a new ring oscillator. The voltage to current converter supplies two pair of N-type MOSFETs. The ring oscillator includes two phase control circuits, one for opposite phases of the oscillatory output.

REFERENCES:
patent: 5600284 (1997-02-01), Nguyen et al.

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