PLL circuit having a multi-band oscillator and compensating oscillation frequency

• US 7,269,402 B2
• Filed: 07/25/2006
• Issued: 09/11/2007
• Est. Priority Date: 05/31/2002
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation), Ttpcom Limited
• Inventors: Uozumi, Toshiya, Kasahara, Masumi, Tanaka, Satoshi, Kimura, Yasuyuki, Henshaw, Robert Astle, Oosawa, Hirotaka
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): CHOW, CHARLES CHIANG
• Application Number:
  US11/491,972
• Publication Number:
  US 20060258312A1
• Time in Patent Office: 413 Days
• Field of Search: 455/252.1, 455/255, 455/258, 455/260, 455/262, 455/264, 455/333, 455/334, 455/425, 455/550.1, 455/575.1, 455/561, 455/412.1, 455/418, 455/67.11, 455/63.1, 455/456.5, 455/456.6, 455/208, 455/67.14, 455/147, 455/180.3, 455/183.1, 455/182.1, 455/186.1, 455/185.1, 455/226.1, 455316-318, 455/161.1, 331/17, 331/25, 331/44, 331/176, 331/107.R, 331/66, 331/68, 331/177.R, 331/16, 331/175, 327/138, 327/156, 327/157, 327/127
• US Class Current: 455/255
• CPC Class Codes: H03L 1/02 against variations of temperature only
• 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 7/099 concerning mainly the controlled oscillator of the loop
• CPC Class Codes: H03L 7/183 a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number H03L7/1806 takes precedence
• CPC Class Codes: H03L 7/187 using means for coarse tuning the voltage controlled oscillator of the loop H03L7/191 - H03L7/195 take precedence

Abstract

A semiconductor integrated circuit device for communication is provided with a PLL circuit or the like formed therein, the PLL circuit which is capable of realizing the compensation of fluctuation due to temperature change, the inhibition of increase in the chip area and the ensurement of the performance margin, and which controls a VCO having multiple oscillation frequency bands. In the case where automatic calibration is performed by switching a switch to a side of a DC voltage source in the PLL circuit using a VCO having multiple oscillation bands, a tuning voltage (Vtune) of an RFVCO is fixed to a voltage value of a DC voltage source. However, since a temperature characteristic of canceling a VCO oscillation frequency is given to the DC voltage source, it is possible to minimize the influence on the band selection when a calibration table comes to no optimum one.

Claims

1. A communication apparatus comprising a circuit device having an oscillating means for oscillating in a plurality of frequency bands, a signal generating means which includes said oscillating means for generating an oscillation signal according to desired frequency information,

wherein said circuit device comprising:

a power source means for generating a DC voltage as a control voltage of said oscillating means, when the frequency of said oscillating means increases in accordance with increasing of said control voltage of said oscillating means, said DC voltage having reverse dependence to dependence of said oscillating means in frequency relative to temperature in the case, when the frequency of said oscillating means decreases in accordance with increasing of said control voltage of said oscillating means, said DC voltage having the same dependence as dependence of said oscillating means in frequency relative to temperature in the case,

a counter means for measuring an oscillation frequency of said oscillating means;

a storage means for storing frequency information measured per each frequency band of said oscillating means by said counter means; and

a control means for performing calibration by connecting said oscillating means to said power source means, oscillating said oscillating means in accordance with one of said DC voltage supplied from said power source means, measuring this oscillation frequency per each frequency band of said oscillating means by said counter means, and storing the oscillation frequency in said storage means.

2. A communication apparatus comprising a circuit device having an oscillating means for oscillating in a plurality of frequency bands, a signal generating means which includes said oscillating means for generating an oscillation signal according to desired frequency information,

wherein said circuit device comprising:

a power source means for generating a DC voltage as a control voltage of said oscillating means, when the frequency of said oscillating means increases in accordance with increasing of said control voltage of said oscillating means, said DC voltage having reverse dependence to dependence of said oscillating means in frequency relative to temperature in the case, when the frequency of said oscillating means decreases in accordance with increasing of said control voltage of said oscillating means, said DC voltage having the same dependence as dependence of said oscillating means in frequency relative to temperature in the case;

a counter means for measuring an oscillation frequency of said oscillating means;

a storage means for storing frequency information measured per each frequency band of said oscillating means by said counter means; and

a control means for performing recalibration after said oscillating means is connected to said power source means, oscillating said oscillating means in accordance with one of said DC voltage supplied from said power source means, measuring an error of a first frequency band out of all frequency bands of said oscillating means by said counter means when this oscillation frequency is measured, estimating, from the error, errors of the other frequency bands, and storing the errors in said storage means.