Radio transmitter-receiver

Abstract

Abstract PURPOSE:To switch a communication channel in a communication band at a high speed by dividing a local oscillator frequency band into plural bands and providing a PLL frequency synthesizer on every divided frequency band in a radio transmitter-receiver having lots of communication channels in a prescribed frequency band. CONSTITUTION:N sets of PLL frequency synthesizers 101a-101n are provided on the radio transmitter-receiver. An output switching circuit 102 is a circuit selecting any of the frequency synthesizers 101a-101n and connecting the selected synthesizer to a transmission circuit 1 and a receiver circuit 2 and employs a PIN switch or the like for a high speed switch. A frequency control circuit 7 sends 2 kinds of signals, a frequency setting signal to control the generated frequency from the frequency synthesizers 101a-101n and a switching signal to a switching control signal 11 to control the switching to set the connection line of the output switching circuit 102. Thus, a higher speed frequency switching than the use of only one frequency synthesizer is attained.

Inventors

• 👤 Nozomi Watanabe
• 👤 望 渡邉

Bibliographic Details