Renesas Technology Corp.

Ttpcom Limited

Tipcom Limited

Hiroshi Hagisawa

Robert Astle Henshaw

Yasuyuki Kimura

Kazuhiko Hikasa

Patrick Wurm

Ryoichi Takano

David Freeborough

A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.

Transmitter and semiconductor integrated circuit for communication

Wireless communication apparatus having a phase control loop shared by first and second modulation modes and an amplitude control loop

Transmitter having a phase control loop whose frequency bandwidth is varied in accordance with modulation modes

Growing community of inventors

Tamamura, Japan

Hiroshi Hagisawa