Title:
ON-OFF CIRCUIT FOR SUPERPOSING HIGH FREQUENCY
Document Type and Number:
Japanese Patent JP3545773
Kind Code:
B2
Abstract:
PURPOSE: To increase the speed for turning on and off the high frequency superposition by quickening the transition of a voltage set on the power source terminal of a high frequency superposing circuit from the ON state to the OFF state.
CONSTITUTION: When the level of an ON-OFF signal inputted to an input terminal 2 becomes low, the ON-OFF signal is imparted to the base of a transister Tr2 and the Tr2 is turned off. The collector potential of the Tr2 becomes a voltage Va set in a power source setting part. Then, the voltage VHF supplied to the power source terminal of a high frequency superposing circuit 1 becomes a voltage lower than the voltage Va of the Tr2 by a voltage between the base and the emitter of a Tr1 and a high frequency current is generated. When the level of the ON-OFF signal becomes high, the Tr2 is turned on, the collector potential of the Tr2 becomes a voltage between the collector and the emitter of the Tr2, the Tri is completely turned off and the circuit 1 is turned off. Since a PNP transister Tr3 makes the transition of the Tr1 from the ON state to the OFF state at high-speed, the circuit 1 is turned on and off at high speed.
Inventors:
Kiaki Sakurai
Application Number:
JP1604693A
Publication Date:
July 21, 2004
Filing Date:
February 03, 1993
Export Citation:
Assignee:
株式会社リコー
International Classes:
G11B7/125; H01S5/06; (IPC1-7): G11B7/125; H01S5/06
Domestic Patent References:
| JP3185637A | ||||
| JP521877A | ||||
| JP4240787A | ||||
| JP6168475A | ||||
| JP33126A |
Attorney, Agent or Firm:
Toru Kabayama
Shogo Honda
Shogo Honda
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