Title:
【発明の名称】電子式視覚支援具
Document Type and Number:
Japanese Patent JP3041721
Kind Code:
B2
Abstract:
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a stabilised local oscillator (LO) frequency signal and a radio frequency (RF) signal from the voltage controlled oscillator (34) to obtain an intermediate frequency (IF) signal. An IF amplifier (42) is connected to a linear frequency discriminator (44) that provides an output signal to a summing amplifier (46), which is connected to the voltage controlled oscillator (34). The closed loop circuit uses the linear frequency discriminator (44) to provide a feedback signal that stabilises the voltage controlled oscillator (34).
Inventors:
Rothko Charles, Williams
Application Number:
JP50289196A
Publication Date:
May 15, 2000
Filing Date:
April 05, 1995
Export Citation:
Assignee:
Rothkowie Williams Limited
International Classes:
A61F9/08; A61H3/06; G01S7/02; G01S7/03; G01S7/282; G01S13/34; G01S13/88; H01Q1/27; H01Q1/38; H01Q21/06; H03B7/12; H03B9/14; H03D9/04; H03D9/06; H03L7/06; G01S7/35; G01S7/41; G01S13/42; G01S13/44; G01S13/58; H03B1/00; H03B5/18; H03B19/18; H03D3/26; H03D7/14; (IPC1-7): G01S13/88; A61F9/08; A61H3/06; G01S7/03; H01Q1/27; H01Q1/38; H01Q21/06
Domestic Patent References:
| JP6300834A | ||||
| JP5844370A | ||||
| JP549488A | ||||
| JP517620U | ||||
| JP1107306U |
Other References:
【文献】独国公開3613258(DE,A1)
Attorney, Agent or Firm:
Masaki Yamakawa (5 outside)