A Proposed Technique to Improve the Performance of Receiver by Using Linear Gm-C Low-Pass Filter for mmwave Band Applications

Deep submicron CMOS technology proves to be suitable for transceiver design at mmwave band frequencies. At the same time, it has been a challenging task to obtain high performance at mmwave frequencies. In this paper, a 28[Formula: see text]GHz low-IF receiver frontend with improved performance by incorporating a proposed linear Gm-C low-pass filter (LPF) is presented using 40[Formula: see text]nm CMOS technology targeting for 5G wireless system. A mathematical expression for the linearity of the proposed filter is derived and compared with the basic filter model. The improved linearity (IIP3 of [Formula: see text][Formula: see text]dBm) of the proposed filter results in the enhancement of linearity and hence the Figure of Merit (FOM) of the receiver with the proposed filter. The receiver attains a conversion gain of 34.6[Formula: see text]dB, a noise figure of 3.1[Formula: see text]dB and IIP3 of [Formula: see text][Formula: see text]dBm. The total current drawn by the receiver is 27.3[Formula: see text]mA at a 1.2[Formula: see text]V power supply. The overall FOM of the receiver with the proposed filter is improved to 0.30 whereas the FOM of the receiver with the basic filter model is 0.13. The area of the receiver is [Formula: see text] whereas the proposed filter occupies [Formula: see text].

Pass-Band Gain Improvement Technique for Passive RC Polyphase Filter in Bluetooth Low-IF Receiver Using Two RC Band-Stop Filters

This paper proposes a method to design a flat pass-band gain with two RC band-stop filters for a 4-stage passive RC polyphase filter in a Bluetooth receiver. Based on the superposition principle, the transfer function of the poplyphase filter is derived. However, the pass-band gain of this filter is not flat on the positive frequency domain. There are two local maximum values when the input signals are the wanted signals. Therefore, two RC band-stop filters are used to improve the pass-band gain of these local maximum values. As a result, a flat pass-band gain passive RC poly-phase filter is designed for a Bluetooth low-IF receiver which image rejection ratio is-36dB, and ripple gain is 0.47dB.

Design Proposal for Inductor Type Buck Converter in Bluetooth Receiver Chip with Overshoot Cancellation and Ripple Reduction Technique

This paper presents a novel circuit design technique for an inductor type step-down buck converter in a blue-tooth receiver. Based on the superposition principle, a model of this system is proposed and verified by simulation. The overshoot phenomena is well controlled when R, L and C components are chosen by a relation |ZL|=|ZC|=2R based on a balanced charge and discharge time condition T=2π√LC=4πRC. Furthermore, a fundamental harmonic notch filter is recommended to keep small ripple which is designed at the fundamental harmonic frequency of PWM signal. A battery supply voltage of 3.6V was applied to the converter and the output voltage was set to 1.8V. The design of this methodology is given through the CMOS technology. As a result, a 1.8V stable step-down buck converter is designed for a blue-tooth low-IF receiver which the ripple is smaller than 0.2mVpp.