Time interleaved converter arrays

Abstract

High-speed monolithic converters norrpally use a variation of the flash technique, which uses 2n comparators in parallel to obtain a fast n-bit conversion. Although this method allows for high converter bandwidth, it is not very area efficient,~d results in large dle sizes for even modest resolution c~nverters. In the technique presented here, a number of small but Vea efficient converters are operated in a time-interleaved fashion. to achieve the bandwidth of a flash 'circuit, but in a substantially smaller area. This technique is analyzed with respect to noise~d distortion resulting from nonidesl array characteristics, aqd is~emonstrated by way of a four-way array test-chip. This qhip consists" of four time-interleaved 7-bit wei~ted-capacitor A/D converte~sj fabricated in a 10 #m metal-gate CMOS process. Full 7-bit kine~ity @ maintained up to a 2.5 MHz conversion rate, with operation at feduced liiearity continukg to~pproximately 4 MHz. The design of this chip, and anticipated characteristics if fabricated in a modern 4-5 '&mprocess tie describe&

Efficient real-time blind calibration for frequency response mismatches in two-channel TI-ADCs

“…11, the convergence curves precisely tend to the preset values. 1 Example 2: To demonstrate the versatility of the calibration method with different types of input signal, we consider a signal containing 15, 9 and 15 sinusoids, respectively. Moreover, the signal was quantized to 14 bits.…”

“…Since Black and Hodges firstly proposed the concept of time-interleaved analog-todigital converters (TI-ADCs) in 1980 [1], this high-speed sampling architecture has become a focus in the field of modern mixed signal processing. As shown in Fig.…”

Experimental characterization of mutually synchronized voltage edges in point-coupled tunnel diode transmission lines

“…It results in the synchronization properties such that the phase difference and frequency shifts depend on the cell at which the TD lines couple. Using this property, we proposed a scheme to develop multiphase oscillators [2,3,4,5], which contribute to several cost-effective electronic systems including parallelism and effective encoding, using several coupled TD lines. [6] As mentioned above these previous studies have been carried out with the aid of numerical methods.…”

A calibration method for frequency response mismatches in <i>M</i>-channel time-interleaved analog-to-digital converters

“…Time-interleaved analog-to-digital converter (TIADC) [1] and hybrid filter bank analog-to-digital converter (HBF ADC) [2] are two similar schemes to achieve high sampling rate by employing several analog-to-digital converters (ADCs) operating in parallel. The TIADC scheme stands out because of its simplicity in hardware implementation.…”