Resources Contact Us Home
On-chip R-C time constant calibration

Image Number 2 for United States Patent #7548129.

An integrated tuner includes circuitry to receive a television signal, a quadrature mixer coupled to the output of the circuitry, a polyphase filter coupled to the output of the quadrature mixer, a relaxation oscillator, and a digital calibration module. The relaxation oscillator generates a clock having a period that is directly proportional to the on-chip RC time constant. The clock is fed into a counter of the digital calibration module. The counter is started and stopped at predefined time intervals by a finite state machine. The finite state machine updates the calibration code based on a successive approximation algorithm according to the end count results received from the counter. The digital calibration module outputs the updated calibration code to the polyphase filter and to the relaxation oscillator.

  Recently Added Patents
Resonant oscillator with start up and shut down circuitry
Module-code verification layer to automatically validate user input
Sliding-type portable communication device
TRPM8 antagonists and their use in treatments
Pulsed plasma with low wafer temperature for ultra thin layer etches
Driving system of display panel having a circuit of a voltage generator and driving method thereof
System for implementing dynamic pseudorandom keyboard remapping
  Randomly Featured Patents
Terminal fixture and a method of manufacturing the same
Treatment of spinal metastases
Combined food and condiment container
Image forming apparatus to perform color substitution, and method for controlling the same
El display device and electronic device
Rocker bushings for pivotal movement
Recreational vehicle
Interconnection control method in cordless telephone system
Techniques for triple and quadruple damascene fabrication
Derivatives of isoquinoline (and naphthalene) sulfonamides