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
Cartridge for conducting a chemical reaction
Compounds with (1 E, 6E)-1,7-bis-(3,4-dimethoxyphenyl)-4,4-disubstituted-hepta-1,6-diene-3,5-d- ione structural scaffold, their biological activity, and uses thereof
Processing circuitry for use with a position sensor
Newly identified human rhinovirus of HRV-C and methods and kits for detecting HRV-Cs
Method and system for updating device management application meter read logic
Method and system for the assignment of security group information using a proxy
Target output device and extreme ultraviolet light source apparatus
  Randomly Featured Patents
Method for providing text messaging confirmation
Optical communication system
Efficient implementation of large size FFT
Thermoplastic skin packing means
Underground object locator
Disc brake with an adjusting system
Aminopyrimidine compounds and methods of use
Process for the manufacture of very high-purity antithaemophilic factor (FVIIIc), and von Willebrand factor, and pharmaceutical compositions containing same
Fractionating apparatus
Heat sink mounting for power semiconductors