Method and apparatus for providing coarse and fine tuning control for synthesizing high-frequency signals for wireless communications

• US 6,388,536 B1
• Filed: 06/27/2000
• Issued: 05/14/2002
• Est. Priority Date: 05/29/1998
• Status: Expired due to Term

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Silicon Laboratories Incorporated
• Inventors: Welland, David R.
• Primary Examiner(s): KINKEAD, ARNOLD M
• Application Number:
  US09/604,228
• Time in Patent Office: 686 Days
• Field of Search: 331/117.R, 331/36.C, 331/177.V, 331/167, 331/177.R, 327/107, 327/159, 455/260, 455/262
• US Class Current: 331/177.00R
• CPC Class Codes: H03B 5/1212 the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/1265 switched capacitors
• CPC Class Codes: H03D 7/165 at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002
• CPC Class Codes: H03L 7/087 using at least two phase detectors or a frequency and phase detector in the loop
• CPC Class Codes: H03L 7/0891 the up-down pulses controlling source and sink current generators, e.g. a charge pump
• CPC Class Codes: H03L 7/099 concerning mainly the controlled oscillator of the loop
• CPC Class Codes: H03L 7/113 using frequency discriminator
• CPC Class Codes: H03L 7/187 using means for coarse tuning the voltage controlled oscillator of the loop H03L7/191 - H03L7/195 take precedence
• CPC Class Codes: H03L 7/199 with reset of the frequency divider or the counter, e.g. for assuring initial synchronisation

Claims