Title:
TRANSMITTER-RECEIVER SYSTEM
Document Type and Number:
Japanese Patent JP3203097
Kind Code:
B2
Abstract:
PURPOSE: To provide a transmitter-receiver system where an element with a wide linear region is not necessary to be used for a mixing circuit.
CONSTITUTION: When an antenna 31 and a transmitter 10 are connected with the input side of an envelope detection circuit 13 by an antenna switch 36, the high frequency output signal of the transmitter is inputted in the envelope detection circuit. A first switch 32 switching so as to input the reception signal from the antenna in the envelope detection circuit when the antenna and the receiver 20 are connected is provided. On the side of the output of a level comparison circuit 14, when the high frequency output signal of the transmitter is inputted in the envelope detection circuit by the first switch, the switching is performed so as to control a transmission output level by the output of the level comparison circuit. A second switch 33 switching so as to control the amplification factor of the high frequency amplifier on the side of a receiver by the output of the level comparison circuit when the reception signal is inputted in the envelope detection circuit by the first switch is provided.
Inventors:
Tetsuhiro Maeda
Application Number:
JP12956893A
Publication Date:
August 27, 2001
Filing Date:
May 31, 1993
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H04B1/04; H04B1/18; H04B1/26; H04B1/40; H04B7/26; H04W52/04; (IPC1-7): H04B7/26; H04B1/04; H04B1/18; H04B1/26; H04B1/40
Domestic Patent References:
| JP5847335A | ||||
| JP5122123A | ||||
| JP5615140U |
Attorney, Agent or Firm:
Shiro Nakajima