PHASE-FREQUENCY DETECTOR Russian patent published in 2007 - IPC H03D13/00 

FIELD: radio engineering, automation, systems for automatic control of industrial plant parameters.

SUBSTANCE: proposed phase-frequency detector has D flip-flop whose D input is connected to logic one signal source, two AND gates, NAND gate, OR gate, two JK flip-flops whose inverting outputs are connected to NAND gate inputs; direct output of D flip-flop is connected to direct input of second AND gate and to J inputs of JK flip-flops whose S inputs are connected to NAND gate output. OR gate inputs function as phase-frequency detector inputs and its output is connected to C input of D flip-flop whose inverting output is connected to R inputs of JK flip-flops, direct outputs of the latter being connected to second inputs of AND gate. C inputs of JK flip-flops are connected to OR gate inputs. Outputs of AND gates are connected to inputs of integrator whose output functions as phase-frequency detector output.

EFFECT: enhanced operating precision of detector due to correcting error brought in double-input integrator as result of difference and distortions input-signal rise time.

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