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
Automated difference recognition between speaking sounds and music
Multicolored light converting LED with minimal absorption
System and method for secure power systems infrastructure communications
Pyridazine compounds for controlling invertebrate pests
Method for fabrication of a semiconductor device and structure
Authorization method for location based services
Combination of the application of antibodies for immunostimulation together with glucocorticoids
  Randomly Featured Patents
Method for control of idle rotations of internal combustion engine
Composite metal sheets
Impeller and shaft assembly for high speed gas compressor
Service processing system and method
Layer system with at least one mixed crystal layer of a multi-oxide
Liquid transfer assay devices
Ball screw
Sheet processing apparatus with buffer for sheet finisher
Low power partitioned PLA