Control circuit for a complementary metal-oxide semiconductor vo

Details Control circuit for a complementary metal-oxide semiconductor vo Control circuit for a complementary metal-oxide semiconductor vo

1998-04-21

2000-01-11

Grimm, Siegfried H.

Oscillators

Ring oscillators

331177R, H03B 502

Patent

active

060140623

ABSTRACT:
An integrated circuit complementary metal-oxide silicon (CMOS) voltage controlled oscillator (VCO) includes a plurality of variable delay elements, connected in a ring configuration, each variable delay element including a pair of parallel connected differential CMOS sections. The parallel-connected differential CMOS sections of each variable delay element are controlled by a differential control voltage whose magnitude sets relative levels of operation of the two differential sections of each variable delay element. These relative levels of operation determine the delay through the variable delay element. The control circuit provides the differential control voltage. The control circuit includes a first section for generating a control current and a pair of current mirror sections that divide the control current, generating a pair of differential control signal components as VGS potentials of a pair of CMOS transistors configured as current mirrors.

REFERENCES:
patent: 5206609 (1993-04-01), Mijuskovic
patent: 5239274 (1993-08-01), Chi

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