摘要:
A reception circuit is provided which can detect the beginning of data regardless of a preamble or a unique word contained or not in a received signal and regardless of coding systems for received signals. The reception circuit includes a correlation operation portion that performs a correlation operation to generate a correlation signal while sliding one symbol of reference signal in relation to a received signal. The reference signal goes to a high level during a first half symbol period and goes to a low level during a second half symbol period. The reception circuit further includes: a delay portion that outputs a delay signal by delaying the received signal for a half symbol period in relation to the received signal; and a data beginning timing detection portion that detects a beginning peak timing for the correlation signal as a beginning timing of data contained in the delay signal.
摘要:
A high-frequency amplifier module includes a driver-stage amplifier 3 that amplifies an RF signal input thereto from an RF input terminal 1, and a final-stage amplifier 5 that amplifies the signal amplified by the driver-stage amplifier 3 and outputs the signal after the amplification to an RF output terminal 7. The driver-stage amplifier 3 is fabricated on a silicon substrate 11, while the final-stage amplifier 5 is fabricated on a gallium arsenide substrate. This configuration downsizes the cost while maintaining a high-frequency characteristic comparable to that in the case where all components of an entire module are fabricated on a gallium arsenide substrate 71.
摘要:
A mixer circuit mixes a target signal with a local oscillation signal to perform frequency conversion of the target signal. Since the mixer circuit uses a pseudo-sine wave as the local oscillation signal, it can carry out stable operation regardless of variations in the amplitude of the local oscillation signal.
摘要:
A reception circuit is provided which can detect the beginning of data regardless of a preamble or a unique word contained or not in a received signal and regardless of coding systems for received signals. The reception circuit includes a correlation operation portion that performs a correlation operation to generate a correlation signal while sliding one symbol of reference signal in relation to a received signal. The reference signal goes to a high level during a first half symbol period and goes to a low level during a second half symbol period. The reception circuit further includes: a delay portion that outputs a delay signal by delaying the reference signal for a half symbol period in relation to the received signal; and a data beginning timing detection portion that detects a beginning peak timing for the correlation signal as a beginning timing of data contained in the delay signal.
摘要:
The present invention relates to a semiconductor device and, more particularly, has for its object to provide a technique for improving the performance of a semiconductor device having a ground terminal and a plurality of signal terminals arranged around the ground terminal. To attain the object, the present invention features isolation between a ground terminal (5, 35) connected to a functional block (11) and a ground terminal (6, 36) connected to a functional block (12). Thus, a ground potential applied to one of the functional blocks through the corresponding ground terminal is prevented from varying depending on the magnitude of a current flowing through the other functional block. This improves the performance of each functional block to improve the performance of the semiconductor device.