| US 7,570,925 B2 | ||
| Discrete amplitude calibration of oscillators in frequency synthesizers | ||
| Jeremy D. Dunworth, Cardiff, Calif. (US); and Brett C. Walker, San Diego, Calif. (US) | ||
| Assigned to QUALCOMM Incorporated, San Diego, Calif. (US) | ||
| Filed on May 18, 2006, as Appl. No. 11/436,915. | ||
| Application 11/436915 is a continuation of application No. 10/092868, filed on Mar. 06, 2002, granted, now 7,062,229. | ||
| Prior Publication US 2007/0049212 A1, Mar. 01, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04B 1/40 (2006.01); H04B 1/06 (2006.01) | ||
| U.S. Cl. 455—76 [455/75; 455/260; 331/182] | 45 Claims |
| 1. An apparatus comprising:
a voltage controlled oscillator to generate an oscillating signal and comprising a configurable circuit to adjust an amplitude
of the oscillating signal;
an amplitude calibration unit to adjust the configurable circuit in discrete steps to obtain a desired amplitude for the oscillating
signal; and
a frequency calibration unit to selectively activate the configurable circuit of the voltage controlled oscillator to adjust
the frequency of the oscillating signal, whereby said frequency calibration unit may selectively activate said configurable
circuit of the voltage controlled oscillator based on a comparison of a signal indicative of the oscillating frequency of
the voltage controlled oscillator and a signal indicative of a reference frequency.
|