Oscillator having loop including transconductor bandpass filter

Details Oscillator having loop including transconductor bandpass filter Oscillator having loop including transconductor bandpass filter

1999-01-22

2000-10-24

Grimm, Siegfried H.

Oscillators

Ring oscillators

331108B, 331135, 331177R, H03B 502

Patent

active

061373702

ABSTRACT:
An oscillator having a feedback loop circuit formed by two transductors and one amplifier, and two capacitors respectively connected to the outputs of these transconductors. The transconductors and the amplifier are constructed by common-source configuration transistors to which common bias current is supplied. Since they have invert characteristics for the input voltage, the feedback loop is also self-biased by means of negative feedback operation. The oscillation signal is outputted from an arbitrary position on the feedback loop of the oscillator. According to the oscillator as constituted, the oscillation frequency can be controlled in a wide range by varying the bias current to the common-source transistors.

REFERENCES:
patent: 4818952 (1989-04-01), Kawano et al.
patent: 5420547 (1995-05-01), Kikuchi
patent: 5444421 (1995-08-01), Carroll et al.
patent: 5635879 (1997-06-01), Sutardja et al.
patent: 5734299 (1998-03-01), Brown
patent: 5852385 (1998-12-01), Izumikawa

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