Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
OSCILLATOR
Document Type and Number:
Japanese Patent JPS63119305
Kind Code:
A
Abstract:

PURPOSE: To suppress harmonic radiation and to stably hold the oscillation frequency by providing a band-pass filter, whose band width is narrower than that of a feedback loop, in the feedback loop.

CONSTITUTION: An LC circuit 10 is turned to a desired frequency, and the emitter circuit of a transistor TR Q is provided with an output resistor R0 connected in parallel to an emitter capacitor C3. The emitter capacitor C3 forms a series resonance circuit together with intrinsic emitter resistance and inductance, and the base bias for the TR Q is supplied by a voltage dividing circuit network consisting of resistors R1 and R2. A narrow band-pass filter like a surface acoustic wave resonator SAWR is connected instead of a base bias capacitor between the base and a circuit voltage return bus, namely, the signal earth. The SAWR forms an equivalent series RLC circuit in the base circuit. Thus, the band width of the feedback loop is sufficiently narrowed to limit higher harmonics up to an allowable level.


Inventors:
Fuiritsupu, Bii Sunou
Emaniyueru, Sangu
Application Number:
JP1987000266132
Publication Date:
May 24, 1988
Filing Date:
October 21, 1987
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SONY TEKTRONIX CORP
International Classes:
H03B5/32; H03H9/54; H03H9/64; (IPC1-7): H03B5/32
Domestic Patent References:
JPS4745457A
JPS5511684A



 
Previous Patent: JPS63119304

Next Patent: SYNCHRONOUS DETECTING CIRCUIT