Voltage-controlled ring oscillator using complementary different

Details Voltage-controlled ring oscillator using complementary different Voltage-controlled ring oscillator using complementary different

1992-05-26

1993-08-24

Grimm, Siegfried H.

Oscillators

Ring oscillators

331108B, 331177R, H03B 502, H03B 2700

Patent

active

052392740

ABSTRACT:
Differential buffers are used in a voltage-controlled oscillator to provide pairs of complementary phase signals. The preferred arrangement includes a ring of the differential buffers. Each differential buffer has a current control input, and the current control inputs of the buffers are all connected to a control voltage input to simultaneously adjust the propagation delay of each of the buffers. In contrast to a conventional ring oscillator, which has an odd number of stages, a ring oscillator made of differential buffers can have an even number of buffers to provide a number of phases that is a multiple of four. The differential buffer preferably includes a pair of CMOS inverters sharing a common PMOS current sourcing transistor and a common NMOS current sinking transistor.

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