Integrated RF Interference Suppression Filter Design Using Bond-Wire Inductors

Abstract

Abstract-Design techniques are presented for the realization of high-performance integrated interference suppression filters using bond-wire inductors. A new configuration is proposed for mitigating the impact of mutual coupling between the bond wires. A differential low-noise amplifier with an integrated on-chip passive interference suppression filter is designed at 2.1 GHz in a 0.18-m CMOS process, and achieves a transmit leakage suppression of 10 dB at 190-MHz offset. The differential filter uses metal-insulator-metal capacitors and bond-wire inductors and occupies only 0.22 mm 2 . The cascaded system achieves a measured gain of 9.5 dB with a 1.6-dB noise figure and 5 dBm out-of-band IIP 3 and consumes 11 mA from a 2-V supply.Index Terms-Bandpass filter (BPF), bond wires, CMOS, interference suppression, mutual inductance, wideband code division multiple access (WCDMA).

An integrated CMOS passive transmitter leakage suppression technique for FDD Radios

“…A front-end on-chip high-Q passive-filter using bond wires is presented in [14], see is extremely challenging because of the lack of high-Q integrated inductors in the frequency bands up to 5 GHz. In [14], a three-pole differential bandpass filter at 2.14 GHz using bond-wire inductors is presented.…”

“…A front-end on-chip high-Q passive-filter using bond wires is presented in [14], see is extremely challenging because of the lack of high-Q integrated inductors in the frequency bands up to 5 GHz. In [14], a three-pole differential bandpass filter at 2.14 GHz using bond-wire inductors is presented. Since the TX and RX are usually separated by only a hundred megahertz, even with a third order bandpass filter, the TX leakage suppression is no more than 10dB [14].…”

“…In [14], a three-pole differential bandpass filter at 2.14 GHz using bond-wire inductors is presented. Since the TX and RX are usually separated by only a hundred megahertz, even with a third order bandpass filter, the TX leakage suppression is no more than 10dB [14].…”

“…Equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) describes the tradeoffs between the transmitter and receiver insertion loss and a graphical interpretation is shown in Fig. 3-13.…”

Active N-path Filters: Theory and Design

“…However, they can be exploited in the transmitter chain after the up-conversion mixer where the required DR is not demanding [36]. Also in [37], a high-order LC BPF by exploiting high Q-factor bond wires has been implemented which have more than 10 dB of insertion loss. An extensive comparison table is given in [24].…”