Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Reexamination Certificate
2006-11-21
2006-11-21
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
C327S359000
Reexamination Certificate
active
07138849
ABSTRACT:
Provided is a phase mixer that compensates for frequency variations and process, voltage, and temperature (PVT) variations, and automatically controls slew rates of input signals according to frequency variations and PVT variations. The phase mixer includes: a mixer, which receives two signals having different phases via input terminals and interpolates the two signals; a frequency detector, which detects frequency variations of an input signal; an integrator, which converts an output signal output from the frequency detector into a DC voltage; and two variable capacitors, which are connected to input terminals of the mixer and have variable capacitances that change in response to the DC voltage. The frequency detector, which is a pulse generator, includes an inversion/delay unit, which inverts and delays the input signal and a NAND gate, which performs a NAND operation on the input signal and a signal output from the inversion/delay unit. Each of the variable capacitors includes a transistor, which has a drain connected to one of the input terminals of the mixer and a gate to which the DC voltage is supplied, and a capacitor, which has a first terminal connected to a source of the transistor and a second terminal connected to a voltage source.
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Callahan Timothy P.
Cox Cassandra
F.Chau & Associates LLC
Samsung Electronics Co,. Ltd.
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