A time-interleaved parallel ΔΣD converter

Abstract

A new architecture for Nyquist-rate analog-to-digital (A/D) conversion is presented. The new architecture combines the concept of time-interleaved A/D converters with the 16 A/D converter. For every doubling of the clock frequency, the resolution of the A/D converter improves by bits, where is the order of the 16 modulators. The advantage of the time-interleaved 16 A/D converter is reduced complexity of the digital filters. Another feature of this architecture is that the linearity of the converters depends on the linearity of each channel and is independent of the number of channels. Index Terms-Analog-to-digital (A/D) converter, Nyquist rate A/D converter, parallel 16, time interleaved A/D converter.

Towards flexible parallel sigma delta modulator for software defined radio receiver

“…In the literature, there are three main parallel architectures [3] as the time-interleaved architecture (TIΣ∆) [4], the Hadamard modulated parallel architecture (ΠΣ∆) [5] and the frequency band decomposition architecture (FBD) [6][7][8]. The TIΣ∆ and ΠΣ∆ architectures present less implementation complexity compared to the FBD architecture.…”

A new interpolation technique for time interleaved $$\Upsigma\Updelta$$ A/D converters

“…To overcome this problem, several research works have been developed employing parallelism to widen the bandwidth of the RD A/D converters: frequency band decomposition (FBD) [4,5], Parallel sigma-delta (PRD) [6], and two techniques of Time Interleaved sigma-delta (TIRD)) [7][8][9][10][11][12]. The major benefit of all of these approaches is that they increase the conversion bandwidth with a linear increase of the power consumption whereas with a single sigma-delta modulator, the power consumption increases exponentially while drastically increasing the bandwidth [13].…”

“…The second TIRD solution proposed in [9][10][11][12] uses as well the same modulator for all channels and recquires reasonable digital resources for signal demultiplexing and signal reconstruction [14]. Besides, no analog signals need to travel between channels which eliminates the modulator architecture and the number of channels constraints from which the first solution suffers.…”

A new interpolation technique for TI ΣΔ A/D converters

“…Sigmadelta (Σ∆) converters are good candidates to achieve high resolution conversion but their bandwidth is very narrow compared to the requirements needed for software radio applications. Several parallelism techniques allow to increase Σ∆ conversion bandwith: Time Interleaved sigma-delta (TIΣ∆) [2], Parallel sigma-delta (ΠΣ∆) [3], and Frequency Band Decomposition (FBD) [4]. The T IΣ∆ solution has the lowest hardware complexity among the three possible techniques and offers the easiest way for reconfiguration.…”