Radio transmitter-receiver, high-frequency radio receiver, and control unit

• US 6,766,156 B1
• Filed: 11/19/1999
• Issued: 07/20/2004
• Est. Priority Date: 03/20/1998
• Status: Expired due to Fees

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Hayashihara, Mikio
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): D AGOSTA, STEPHEN M
• Application Number:
  US09/424,148
• Time in Patent Office: 1,705 Days
• Field of Search: 370/335, 455/295, 455/78, 455/83, 455/230, 455/423, 455/574, 330/296
• US Class Current: 455/295
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A low-noise amplifier 500a having low-distortion characteristics (low distortion LNA), a low-noise amplifier 500b of a low current consumption type(low current consumption LNA), and radio-frequency switches 502 and 509 for selectively switching either of them are provided in a receiving radio-frequency unit 103. On the basis of a mode changing control function of a CPU 113, an LNA switch control signal AS is generated so that the low-distortion LNA 500a is selected during a period in which the operation of a radio transmitter-receiver is in a transmitting/receiving state, and that the low current consumption LNA 500b is selected in a period of a standby state, and thus the switching of the radio-frequency switches 502 and 509 of a low-noise amplifier circuit section 501 is controlled.

Claims

1. A radio-transmitter receiver for simultaneously transmitting/receiving a radio signal including an amplitude variation component, comprising:

a receiving radio-frequency unit having a first operation mode in which an operation is executed at a predetermined first consumption value and with predetermined first distortion characteristics, and a second operation mode in which an operation is executed at a second current consumption value larger than said first current consumption value and with second distortion characteristics having less distortion than said first distortion characteristics;

mode changing control means for allowing said receiving radio-frequency unit to be operated in said second operation mode in a period in which the radio signal is transmitted, or in said first operation made in a period in which the radio signal is not transmitted;

open-loop transmission control means for detecting a receiving level of the radio signal on the basis of a received signal level which is output from said receiving radio-frequency unit, and generating a transmission level control signal on the basis of the detection value so as to variably control a transmitting level of the radio signal; and

variation suppressing means for canceling variation components generated in the transmission level control signal generated in said open-loop transmission control means by the changing of the first operation mode or the second operation mode in said receiving radio-frequency unit.

2. A radio transmitter-receiver comprising:

a receiving radio-frequency unit provided in a radio transmitter-receiver for simultaneously transmitting/receiving a radio signal including an amplitude variation component, said receiving radio-frequency unit including;

a first active circuit section being operated at a predetermined first current consumption value and having predetermined first distortion characteristics;

a second active circuit having the same function as said first active circuit section, and being operated at a second current consumption value larger than said first current consumption value and having second distortion characteristics having less distortion than said first distortion characteristics, and

a switching circuit section for allowing said second active circuit section to be operated selectively in a period in which the radio signal is transmitted, or allowing said first active circuit section to be operated selectively in a period in which the radio signal is not transmitted;

open-loop transmission control means for detecting a receiving level of the radio signal on the basis of a received signal level which is output from said receiving radio-frequency unit, and generating a transmission level control signal on the basis of the detection value so as to variably control a transmission level of the radio signal; and

variation suppressing means for canceling variation components generated in the transmission level control signal generated in said open-loop transmission control means by changing to selectively operate in the first or the second active circuit section in said receiving radio-frequency unit.

3. A radio transmitter-receiver comprising:

a receiving radio-frequency unit for simultaneously transmitting/receiving a radio signal including an amplitude variation component, said receiving radio-frequency unit including;

a one-system active circuit section having a predetermined radio signal receiving function, and

a bias supply changing circuit section for supplying a first bias current allowing said active circuit section to be operated at a predetermined first current consumption value and with predetermined first distortion characteristics, in a period in which the radio signal is transmitted, and for supplying a second bias current allowing said active circuit section to be operated at a second current consumption value larger than said first current consumption value and with second distortion characteristics having less distortion than said first distortion characteristics, in a period in which the radio signal is not transmitted;

open-loop transmission control means for detecting a receiving level of the radio signal on the basis of a received signal level which is output from said receiving radio-frequency unit, and generating a transmission level control signal on the basis of the detection value so as to variably control a transmission level of the radio signal; and

variation suppressing means for canceling variation components generated in the transmission level control signal generated in said open-loop transmission control means by changing of supply of the bias currents in said receiving radio-frequency unit.

4. A radio transmitter-receiver comprising:

a receiving radio-frequency unit for simultaneously transmitting/receiving a radio signal including an amplitude variation component, said receiving radio-frequency unit including;

a first active circuit being operated at a predetermined first current consumption value and having predetermined first distortion characteristics, said first active circuit having a first amplifier and a pair of first matching circuits respectively connected to an input side and an output side of the first amplifier;

a second active circuit having the same function as the first active circuit, and being operated at a second current consumption value larger than the first current consumption value and having second distortion characteristics having less distortion than the first distortion characteristics, said second active circuit having a second amplifier and a pair of second matching circuits respectively connected to an input side and an output side of the second amplifier;

a switching circuit for allowing the second active circuit to be operated selectively in a period in which the radio signal is transmitted, and allowing the first active circuit to be operated selectively in a period in which the radio signal is not transmitted;

open-loop transmission control means for detecting a receiving level of the radio signal on the basis of a received signal level which is output from the receiving radio-frequency unit, and generating a transmission level control signal on the basis of the detection value so as to variably control a transmission level of the radio signal; and

variation suppressing means for canceling variation components generated in the transmission level control signal generated in the open-loop transmission control means by changing of supply of bias currents in the receiving radio-frequency unit.