An integrated Ku-band nanosecond time-stretching system using improved dispersive delay line (DDL)

Abstract

In this paper, we report an on-chip implementation of a Ku-band nanosecond scale time-stretching (TS) system in a 130 nm CMOS process. The system employs a linear chirp generator realized by ramping the control voltage of the voltage controlled oscillator (VCO), a broadband amplitude modulation (AM) circuit and an active dispersive delay line (DDL) improved from a previous integrated DDL, showing 1 ns dispersion over the frequency range from 12 GHz to 16 GHz. This work not only shows the experimental demonstration of the time stretching effect on the pulsed signal, but also indicates the potential for implementation of more complicated time scaling signal processing systems on chip. Index Terms -Time stretching (TS), integrated dispersive delay line (DDL), distributed amplifier (DA), voltage controlled oscillator (VCO), bandpass filter (BPF).

Design of integrated all‐pass filters with linear group delay for analog signal processing applications

“…Table 9 summarizes the major characteristics and performances in the state of the art of integrated filters with linear group delay. The filter structures reported by Xiang et al [19][20][21][22] and Salvucci et al 7 are composed by a cascade of distributed amplifier (DA)-based transversal filters. The DAs are composed by two filters interconnected by active devices.…”

“…18 More recently, some attempts have been made to implement wideband filters with linear group delay in modern semiconductor technologies. [19][20][21][22][23] Most of the works rely on the on-chip implementation of artificial TLs, that is, the approach considered in the present article. However, the design of such filters remains a core problem, since ASP applications require wideband filters presenting, simultaneously, a very linear group delay and a flat magnitude response.…”

“…More recently, some attempts have been made to implement wideband filters with linear group delay in modern semiconductor technologies . Most of the works rely on the on‐chip implementation of artificial TLs, that is, the approach considered in the present article.…”

On-chip demonstration of real time spectrum analysis (RTSA) using integrated dispersive delay line (IDDL)

“…orm a proof-of-concept real on the RZ pulse streams o point out that the IDDL e-bandwidth product (TBP) estimation of the spectrum onstration. The operation of 1,12]. The proposed IDDL gher frequency with larger d the availability of high DDL has the potential of RTSA with fine resolution.…”

A linear group delay filter with tunable positive slope for analog signal processing

“…Apart from spectral analysis, other ASP applications that require dispersive devices are time‐stretching 7 to potentially release the constraints on digitization, or time‐reversal mirror (TRM) for ultra‐wideband communication 8 or compressive receiver 9 . All these applications need linear group delay (LGD) devices that have been designed through very different kind of technology: with optical processes, 8 surface acoustic wave (SAW) filters, 6 and microstrip C‐section structures 10 …”