Fast phase-frequency detector arrangement
First Claim
1. A detector arrangement for detecting a frequency error between an input signal and a reference signal, said detector arrangement comprising:
- a first latch for sampling a quadrature component of said reference signal based on said input signal, to generate a first binary signal;
a second latch for sampling an in-phase component of said reference signal based on said input signal, to generate a second binary signal;
a third latch for sampling said first binary signal based on said second binary signal, to generate the frequency error signal; and
a controller, to which said frequency error signal is supplied, for selectively suppressing operation of a charge pump circuit in response to a control signal derived from said second binary signal.
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Accused Products
Abstract
A detector arrangement for detecting a frequency error between an input signal (DATA) and a reference signal. The detector arrangement comprising first latch circuitry (L1, L2) for sampling a quadrature component (CKQ) of the reference signal based on the input signal, to generate a first binary signal (PDQ); second latch circuitry (L3, L4) for sampling an in-phase component (CKI) of the reference signal based on the input signal, to-generate a second binary signal (PD I); third latch circuitry (L5) for sampling the first binary signal based on the second binary signal, to generate the frequency error signal (FD). The detector further comprising control circuitry (TS) for selectively suppressing operation of a charge pump (82) to which the first binary signal (PDQ) is supplied, in response to a control signal derived from the second binary signal.
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Citations
11 Claims
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1. A detector arrangement for detecting a frequency error between an input signal and a reference signal, said detector arrangement comprising:
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a first latch for sampling a quadrature component of said reference signal based on said input signal, to generate a first binary signal; a second latch for sampling an in-phase component of said reference signal based on said input signal, to generate a second binary signal; a third latch for sampling said first binary signal based on said second binary signal, to generate the frequency error signal; and a controller, to which said frequency error signal is supplied, for selectively suppressing operation of a charge pump circuit in response to a control signal derived from said second binary signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting a frequency error between an input signal and a reference signal, said method comprising the steps of:
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sampling a quadrature component of said reference signal based on said input signal, to generate a first binary signal using a first latch of a detector arrangement; sampling an in-phase component of said reference signal based on said input signal, to generate a second binary signal using a second latch of the detector arrangement; sampling said first binary signal based on said second binary signal, to generate the frequency error signal using a third latch of the detector arrangement; and selectively suppressing operation of a charge pump circuit in response to a control signal derived from said second binary signal.
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10. A detector arrangement for detecting a frequency error between an input signal and a reference signal, said detector arrangement comprising:
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a first latch for sampling a quadrature component of said reference signal based on said input signal, to generate a first binary signal; a second latch for sampling an in-phase component of said reference signal based on said input signal, to generate a second binary signal; a third latch for sampling said first binary signal based on said second binary signal, to generate the frequency error signal; and a controller for selectively suppressing operation of a charge pump circuit to which said first binary signal is supplied, in response to a control signal derived from said second binary signal; wherein said first and second latches each comprise a double-edge triggered flip-flop arrangement. - View Dependent Claims (11)
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Specification