A high performance CMOS direct down conversion mixer for UWB system

Abstract

This paper represents a high performance wideband CMOS direct down-conversion mixer for UWB based on 0.18 µm CMOS technology. The proposed mixer uses the current bleeding technique and an extra resonant inductor to improve the conversion gain, noise figure (NF) and linearity. Also, with an extra inductor and the careful choosing of transistor sizes, the mixer has a very low flicker noise. The shunt resistor matching is applied to have a 528MHz bandwidth matching at 50 Ohm. The simulation results show the voltage conversion gain of 20.5 dB, the double-side band NF of 5.6 dB. Two-tone test result indicates 11.25 dBm of IIP3 and higher than 70 dBm of IIP2. The circuit operates at the supply voltage of 1.8 V, and dissipates 11.5 mW.

A 3.1–4.8-GHz direct-conversion mixer in 0.35-μm CMOS for mode-1 MB-OFDM UWB systems

“…This has led to the 2.2 dB decrease in the DSB-NF above 1 MHz as mentioned above. The obtained DSB-NF of 4.5 dB above 1 MHz is lower than that reported in [12] where the noise figure is lower below 300 kHz due to the C par tuning. Here, reducing the noise figure below 1 MHz may require using switching devices with lower lowfrequency noise spectrum, i.e., lower 1/f noise corner.…”

“…4) with inductors is a useful technique to improve the noise performance of CMOS direct-conversion mixers at low frequencies by reducing the 1/f noise (indirect mechanism) [12,13]. This is achieved when L1 is adjusted to tune-out C par .…”

RF Hardware Modeling of a Direct Conversion Receiver Using SDMA

“…The simulation results for 8-element SDMA and 12-bit quantization are summarized in Table II, along with achieved circuit design parameters, reported in [12], [13] and [14]. In most cases, the specifications obtained from the simulations presented here are significantly exceeded in circuit design implementations.…”

An RF-LO current-bleeding doubly balanced mixer for IEEE 802.15.3a UWB MB-OFDM standard receivers

“…The current-bleeding technique, firstly proposed by Lee and Choi [6], allows improving simultaneously gain and linearity in the case of narrow band (f RF = 900 MHz) single balanced mixers. The same technique was then used in [7] with the doubly balanced mixer topology for an operation from 1.056 to 1.584 GHz only.…”