Digital generation of radio-frequency signals is a key concept of software defined radio. One
of the main difficulties for multi-standard transmitter design based on Delta-Sigma (ΔΣ) …

In this paper, a novel delta-sigma modulator which has a non-uniform quantizer is proposed.
The step sizes of a non-uniform quantizer are, in general, uniquely determined by the …

Analog-to-digital converters based on Discrete-Time Sigma-Delta modulators have enjoyed
great popularity in recent decades, mainly due to their high performance in the bandwidth …

An integrated circuit includes input circuitry for receiving a radio frequency digital signal,
output circuitry capable of delivering a radio frequency analog signal, and a processing …

In this paper, we provide the simulation results for the noise reduction in the delta-sigma
modulator with a non-uniform quantizer under various types of input signals. The delta …

In the software defined radio context, a digital transmitter based on ΔΣ modulation is
proposed. Its architecture is built around two oversampled 3rd-order lowpass digital ΔΣ …

A novel delta-sigma modulator that employs a non-uniform quantizer whose spacing is
adjusted by reference to the statistical properties of the input signal is proposed. The …

Monsieur le Professeur D. DECOSTER m'a accueilli au sem de l'équipe" Optoélectronique"
qu'il dirige et a assuré la direction de ce travail. Je tiens à lui exprimer ma profonde …

∆ Σ 変調器は高 S/N 比を実現できる A/D 変換器として受信機で幅広く使われている一方,
Cartesian 送信機のような電力効率の高い送信機構成でも使われ始めている [1, 2]. しかし,∆ Σ …