Frequency multiplier circuit

Details Frequency multiplier circuit Frequency multiplier circuit

1996-08-14

1997-12-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

327122, H03B 1900

Patent

active

057035091

ABSTRACT:
A frequency multiplier circuit that needs no coupling capacitors and no input bias circuits for a next-stage circuit, which includes a phase-shifted signal generator, first and second differential amplifiers, and a multiplier. The phase-shifted signal generator receives an initial input signal and generates first and second output signals whose phases are shifted by 90.degree. with each other. The first differential amplifier amplifies the first output signal to output a first positive-phase output signal and a first negative-phase output signal. The second differential amplifier amplifies the second output signal to output a second positive-phase output signal and a second negative-phase output signal. The multiplier multiplies the first and second positive-phase output signals to output a third positive-phase output signal as a positive-phase output of the frequency multiplier circuit. At the same time, it multiplies the first and second negative-phase output signals to output a third negative-phase output signal as a negative-phase output of the frequency multiplier circuit. Each of the third positive- and negative-phase output signals has a doubled frequency of the initial input signal and substantially the same dc offset voltage.

REFERENCES:
patent: 5317276 (1994-05-01), Yamamoto
patent: 5392016 (1995-02-01), Nishida et al.
patent: 5559457 (1996-09-01), Uda et al.

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