This paper presents a transceiver that uses a 4-bit flash analog-to-digital converter (ADC) for the receiver and an 8-bit current-steering digital-to-analog converter (DAC) for the transmitter. The 8-GSamples/s converters are 8-way time interleaved. Digital compensation reduces the input offset of the ADC comparators to less than 0.6 LSB, improves the accuracy of the interleaved sampling clocks...

Since wireless channels exhibit dramatic near-instantaneous channel-quality fluctuations, it is unrealistic to expect that a transceiver relying on time-invariant modulation and coding modes is capable of delivering as good a performance as a near-instantaneously adaptive arrangement. Hence, a near-instantaneously adaptive joint-detection code division multiple access (CDMA)-based video transce...

This paper presents a transceiver that uses a 4-bit flash ADC for the receiver and an 8-bit current-steering DAC for the transmitter. The 8-GSa/s converters are 8-way time interleaved. Digital compensation reduces the input offset of the ADC comparators to less than 0.6 LSB, improves the accuracy of the interleaved sampling clocks to within 10 ps, and reduces systematic coupling noise to less t...

In this paper, we proposed a high data rate, low-power, and large random jitter tolerance wideband signaling (WBS) transceiver for human body channel communication (BCC). At the transmitter part, a spread spectrum clock generator is applied to reduce the electromagnetic emission. Subsequently, the proposed WBS transmitter uses a NRZI encoding scheme to transmit the data. At the receiver part, a...

Frequency-Modulated Continuous-Wave (FMCW) Radar has traditionally been used in short range applications. Conventional FMCW radar requires the use of expensive microwave mixers and low noise amplifiers. A uniquely inexpensive solution was created, using inexpensive Gunn oscillator based microwave transceiver modules that consist of 3 diodes inside of a resonant cavity. However these transceiver...

A direct conversion modulator-demodulator with even harmonic mixers with emphasis on noise analysis is presented. The circuits consist of even harmonic mixers (EHMs) realized with antiparallel diode pairs (APDPs). We evaluate the different levels of I/Q imbalances and DC offsets and use signal space concepts to analyze the bit error rate (BER) of the proposed transceiver using M-ary QAM schemes...

www.rfdesign.com February 2001 I today’s world of miniaturization, there is everincreasing industry pressure to reduce the cost of communication chips. This pressure has driven designers to develop transceivers with higher levels of integration1. Achieving the goal of maximum integration between the antenna and data output is not as trivial as replacing external components with on-chip componen...

We present a time-resolved optical technique to measure electron spin dynamics with GHz dynamical bandwidth, transform-limited spectral selectivity, and phase-sensitive (lock-in) detection. Use of a continuous-wave (CW) laser and fast optical bridge enables greatly improved signal-to-noise characteristics compared to traditional optical sampling (pump-probe) techniques. We demonstrate the techn...

We developed an optical transceiver diode (TRAD) module for bi-directional time-compression-multiplexing (TCM) transmission systems. A wavelength-insensitive structure as a receiver and a low-capacitance configuration in the module provide a high sensitivity. Stable switching of 156 Mbit/s NRZ burst signals between the transmitter and receiver modes is achieved. In addition, it is shown that op...

An H.263-based video transceiver is contrived, which maintains a near-constant bitrate and due to the proposed packetisation and packet dropping regime it provides near-unimpaired video quality for frame error rates upto 5%. The target frame error rate is maintained by invoking a novel power-control technique.