Title:
直接ディジタルチューニングを使用する電圧制御発振器の注入ロックのための方法と装置
Document Type and Number:
Japanese Patent JP4384036
Kind Code:
B2
Abstract:
The invention relates to the field of electronics and more particularly to the tuning and injection locking of voltage controlled oscillators (VCOs). An improved injection locking circuit is provided which allows the VCO to injection lock with a smaller reference signal and therefore a smaller locking bandwidth (LBW). In order to allow the VCO to injection lock with a lower power reference signal, this invention includes a pre-tuning algorithm to place the VCO frequency such that the desired frequency is in the LBW. Tuning of the VCO is achieved using direct digital tuning that does not require an input reference. Injection locking is performed using a low frequency clock harmonic as the reference signal. More specifically, tuning is accomplished by sub-sampling and digitizing the output signal of the VCO, determining the center frequency, and adjusting the VCO control voltage.
Inventors:
Debris, Christopher Andrew
Ralph Dixon, Mason
Ralph Dixon, Mason
Application Number:
JP2004526550A
Publication Date:
December 16, 2009
Filing Date:
August 11, 2003
Export Citation:
Assignee:
Clear Semiconductor Corporation
International Classes:
H03L7/24; H03B5/12; H03L7/099
Domestic Patent References:
| JP9162730A | ||||
| JP2305103A | ||||
| JP62047212A |
Foreign References:
| US5394117 | ||||
| US6121847 |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shimichi Akihisa
Kurachi Yasuyuki
Masaya Nishiyama
Jun Tsuruta
Tetsuro Shimada
Shimichi Akihisa
Kurachi Yasuyuki
Masaya Nishiyama