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US 11,239,797 B1Granted
Regenerative frequency doubler
AssigneeQUALCOMM Incorporated
InventorsOmar Essam El-Aassar, Bhushan Shanti Asuri
Life of this patent
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Abstract
A frequency doubler is provided that filters an input signal to form I and Q components responsive to a tuning signal. A single sideband mixer mixes the I and Q components with I and Q components of a local oscillator signal to form an output signal having a frequency of twice the frequency of the input signal.
Claims28
A frequency doubler, comprising:
- a first pair of Gilbert cells configured to mix a differential in-phase input signal with a differential in-phase local oscillator signal to drive a differential output signal at a pair of output nodes;
- a second pair of Gilbert cells configured to mix a differential quadrature-phase input signal with a differential quadrature-phase local oscillator signal to drive the differential output signal at the pair of output nodes;
- and
- a frequency divider configured to divide the differential output signal into the differential in-phase local oscillator signal and into the differential quadrature-phase local oscillator signal.
1 more element
A method of frequency doubling, comprising:
- filtering a differential input signal into a differential in-phase input signal and a differential quadrature-phase input signal responsive to a tuning signal;
- mixing the differential in-phase input signal with a differential in-phase local oscillator signal to drive a differential output signal;
- mixing the differential quadrature-phase input signal with a differential quadrature-phase local oscillator signal to drive the differential output signal;
- filtering the differential output signal to block a DC signal from the differential output signal;
- and
- converting the DC signal into the tuning signal.
3 more elements
A frequency doubler, comprising:
- a tunable input filter configured to filter a differential input signal responsive to a tuning signal to form a differential in-phase input signal and a differential quadrature-phase input signal;
- a frequency divider configured to divide a differential output signal in frequency by a factor of two to produce a differential in-phase local oscillator signal and a differential quadrature-phase local oscillator signal;
- a single sideband mixer configured to mix the differential in-phase input signal with the differential in-phase local oscillator signal and to mix the differential quadrature-phase input signal with the differential quadrature-phase local oscillator signal to produce the differential output signal at a pair of output nodes;
- and
- a DC-blocking output filter coupled between the pair of output nodes.
2 more elements
A method of frequency doubling, comprising;
- filtering a differential input signal responsive to a tuning signal into a differential in-phase input signal and a differential quadrature-phase input signal;
- dividing a differential output signal in frequency by a factor of two to form a differential in-phase local oscillator signal and a differential quadrature-phase local oscillator signal;
- forming the differential output signal by mixing the differential in-phase input signal with the differential in-phase local oscillator signal and by mixing the differential quadrature-phase input signal with the differential quadrature-phase local oscillator signal;
- and
- filtering the differential output signal in a DC-blocking output filter.
2 more elements
Dependencies are inferred from the claim text.