Title:
【発明の名称】AGC及びオンチップチューニング付水晶発振器
Document Type and Number:
Japanese Patent JP2001522185
Kind Code:
A
Abstract:
A highly stable single chip crystal controlled oscillator with automatic gain control. An amplitude detector monitors the output of a crystal controlled oscillator amplifier and produces a feedback signal proportional to the output signal of the amplifier to ensure oscillation is induced at startup and that the amplitude of oscillation is limited to a preselected value during operation to conserve power consumption by the amplifier. The capacitor tank circuit connected to the input of the amplifier includes a voltage variable capacitor the voltage across which is initially established at manufacture to tune the oscillation frequency to a preselected value. The voltage across the voltage variable capacitor is also adjusted to compensate for temperature variations in the circuit.
Inventors:
Jardenforce, Torbjän
Bengtson, Erik
Ensterem, Hecan
Bengtson, Erik
Ensterem, Hecan
Application Number:
JP2000519504A
Publication Date:
November 13, 2001
Filing Date:
October 06, 1998
Export Citation:
Assignee:
Telefon Acty Bora Get Elm Ericsson (Pubble)
International Classes:
H03B5/04; H03B5/36; H03L1/02; H03L5/00; H03B5/32; (IPC1-7): H03B5/32; H03B5/36; H03L1/02; H03L5/00
Attorney, Agent or Firm:
Yasunori Otsuka (1 person outside)