Frequency multiplier circuit
First Claim
1. A frequency multiplier circuit comprising:
- a phase-shifted signal generator for receiving an initial input signal to generate first and second output signals whose phases are shifted by 90°
with each other;
a first differential amplifier for receiving said first output signal to amplify said first output signal and for outputting a first positive-phase output signal and a first negative-phase output signal;
a second differential amplifier for receiving said second output signal to amplify said second output signal and for outputting a second positive-phase output signal and a second negative-phase output signal;
a multiplier for receiving said first and second positive-phase output signals to multiply said first and second positive-phase output signals, outputting a third positive-phase output signal as a positive-phase output of said frequency multiplier circuit, receiving said first and second negative-phase output signals to multiply said first and second negative-phase output signals, and outputting a third negative-phase output signal as a negative-phase output of said frequency multiplier circuit;
wherein each of said third positive- and negative-phase output signals has a doubled frequency of said initial input signal and substantially the same dc offset voltage.
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Accused Products
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° 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.
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Citations
6 Claims
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1. A frequency multiplier circuit comprising:
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a phase-shifted signal generator for receiving an initial input signal to generate first and second output signals whose phases are shifted by 90°
with each other;a first differential amplifier for receiving said first output signal to amplify said first output signal and for outputting a first positive-phase output signal and a first negative-phase output signal; a second differential amplifier for receiving said second output signal to amplify said second output signal and for outputting a second positive-phase output signal and a second negative-phase output signal; a multiplier for receiving said first and second positive-phase output signals to multiply said first and second positive-phase output signals, outputting a third positive-phase output signal as a positive-phase output of said frequency multiplier circuit, receiving said first and second negative-phase output signals to multiply said first and second negative-phase output signals, and outputting a third negative-phase output signal as a negative-phase output of said frequency multiplier circuit; wherein each of said third positive- and negative-phase output signals has a doubled frequency of said initial input signal and substantially the same dc offset voltage. - View Dependent Claims (2, 3)
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4. A frequency multiplier circuit comprising:
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a differential amplifier for receiving an initial input signal to amplify said initial input signal and for outputting a first positive-phase output signal and a first negative-phase output signal; a first phase-shifted signal generator for receiving said first positive-phase output signal to generate first and second output signals whose phases are shifted by 90°
with each other;a second phase-shifted signal generator for receiving said first negative-phase output signal to generate third and fourth output signals whose phases are shifted by 90°
with each other; anda multiplier for receiving said first and second output signals to multiply said first and second output signals, outputting a second positive-phase output signal as a positive-phase output of said frequency multiplier circuit, receiving said third and fourth output signals to multiply said third and fourth output signals, and outputting a second negative-phase output signal as a negative-phase output of said frequency multiplier circuits, wherein each of said second positive- and negative-phase output signals has a doubled frequency of said initial input signal and substantially the same dc offset voltage. - View Dependent Claims (5, 6)
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Specification