Current type ring oscillator, and voltage-controlled oscillator

Details Current type ring oscillator, and voltage-controlled oscillator Current type ring oscillator, and voltage-controlled oscillator

1997-03-06

1998-06-23

Grimm, Siegfried H.

Oscillators

Ring oscillators

331135, H03B 502

Patent

active

057709785

ABSTRACT:
A current type inverter circuit used in a Current Type Ring Oscillator and a Voltage-Controlled oscillator operates at a high speed with a low power consumption. A reference power source 1 has one end connected to a power source VDD and the other source receiving a reference current Iref. A drain and a gate of an NMOS transistor Q1 of a current mirror circuit CM1, as an input part, receive an input current Iin. A drain of an NMOS transistor Q2 is connected to an node N1 of the other end side of the reference power source 1 as an output part. As an input part, a drain and a gate of an NMOS transistor Q3 of a current mirror circuit CM2 are connected to the node N1 while a drain of an NMOS transistor Q4 functions as an output part for outputting an output current Iout. The transistors are set so that all of the conditions TS1.gtoreq.1, TS2.gtoreq.1 and TS1.multidot.TS2>1 are satisfied where TS1 is a ratio of the size of the NMOS transistor Q2 to the size of the NMOS transistor Q1 and TS2 is a ratio of the size of the NMOS transistor Q4 to the size of the NMOS transistor Q3.

REFERENCES:
patent: 5278522 (1994-01-01), Atriss et al.
patent: 5289054 (1994-02-01), Lucas
patent: 5525938 (1996-06-01), Monk et al.
IEEE Journal of Solid-State Circuits, vol. SC-22, No. 2, pp. 255-261, Apr. 1987, Deog-Kyoon Jeong, et al., "Design of PLL-Based Clock Generation Circuits".

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