A 6 Gb/s Low Power Transimpedance Amplifier with Inductor Peaking and Gain Control for 4-channel Passive Optical Network in 0.13 μm CMOS

Abstract

Abstract-This paper presents a 6 Gb/s 4-channel arrayed transimpedance amplifiers (TIA) with the gain control for 4-channel passive optical network in 0.13 mm complementary metal oxide semiconductor (CMOS) technology. A regulated cascode input stage and inductive-series peaking are proposed in order to increase the bandwidth. Also, a variable gain control is implemented to provide flexibility to the overall system. The TIA has a maximum 98.1 dBΩ gain and an input current noise level of about 37.8 pA/Hz. The die area of the fabricated TIA is 1.9 mm x 2.2 mm for 4-channel. The power dissipation is 47.64 mW/1ch.

A 65 nm CMOS Feedforward Transimpedance Amplifier for Optical Fibers Communications

“…Bearing in mind that the TIA gain has changed in nature compared with the SPL TIA, however, the rest of formulas remained unchanged. In Equation (36), the term 𝐴(𝑌 𝐴𝐼𝐿 + 𝑔 𝑑𝑠1 ) is also reduced, leading to reduction in the voltage gain from node 𝑌 to output node 𝑂 (i.e 𝑉 𝑜 𝑉 𝑦 ⁄ ) , hence lowering the magnitude of the term 𝑍 𝑦 2 𝑔 𝑑𝑠7 (𝑉 𝑜 𝑉 𝑦 ⁄ ) 2 in Equations (37-38).…”

“…Front-end optical preamplifiers in the form of transimpedance amplifers (TIA) have become a viable optical receiver option as a first stage integrated within a comprehensive optical communication system. The search for low-power transimpedance amplifiers with wide bandwidth lead to the common form of regulated cascode (RGC) used in optical receiver topologies [1][2][3][4][5][6]. However, modification of the RGC structure in terms of input impedance has been the subject for research to achieve wider bandwidths.…”

“…However, modification of the RGC structure in terms of input impedance has been the subject for research to achieve wider bandwidths. Structures such as T-matching network [1], series inductor peaking [2], a capacitive degeneration technique [4], a common-gate feedforward TIA [7], a dual-mode feedforward TIA [8] and a feedforward current amplifier TIA [9] were considered. In terms of 65 *Corresponding Author Institutional Email: abdullahidrees@uomosul.edu.iq (A. I. Mustafa) nm CMOS process technology, various topologies were reported such as an modified RGC TIA using peaking inductors [10], an RGC block and a differential amplifier with active feedback TIA [11] and adjustable gain peaking TIA [12].…”

A design methodology to extend bandwidth for regulated cascode transimpedance amplifier

“…Nevertheless, the input impedance of conventional RGC TIA needs to be further modified to provide enough bandwidth. Up to now, numerous approaches to achieving wide bandwidth have been proposed, such as series inductor peaking [6], T-matching network [7], multi-path TIAs [8], and capacitive degeneration technique [9]. Yet, wide-band obtained by these techniques is at the expense of large chip area or/and gain reduction.…”

“…To meet the requirements of low cost, high integration, and high manufacturability, TIAs based on CMOS technology have been actively investigated in the past decade. Due to the features of wide bandwidth and low power consumption, TIAs with regulated cascode (RGC) topology are widely explored in broadband optical receiver system [6,7,8,9,10,11]. Nevertheless, the input impedance of conventional RGC TIA needs to be further modified to provide enough bandwidth.…”