This paper presents the fifth-order elliptic low-pass Gm-C filter (LPF) used in direct conversion receivers for Zigbee applications. The proposed LPF is designed based on rail-to-rail differential input voltage transconductance amplifier (OTA). The high linearity OTA is designed by combining two previous linearization techniques in [3] and [4]. The 5-order elliptic low-pass GmC filter has a tun...

A 12th-order OTA-C complex filter with a nonconventional frequency tuning for a Bluetooth receiver is implemented in a low-cost mainstream 0.35m CMOS process. This proposed frequency tuning scheme is simpler than the conventional one based on phased-locked loop (PLL). Furthermore, a high-speed pseudo differential OTA using common-mode feedforward (CMFF) and common-mode feedback (CMFB) strategy ...

In this paper, we present a novel operational transconductance amplifier (OTA) topology based on dual-path body-driven input stage that exploits current mirror-active load and targets ultra-low-power (ULP) ultra-low-voltage (ULV) applications, such as IoT or biomedical devices. The proposed OTA exhibits only one high-impedance node, can therefore be compensated at the output stage, thus not req...

Abstract—A Sigma-Delta topology with reduced sensitivity to OTA gain nonlinearities has been introduced. The most important feature of this topology is that the signal transfer function is unity, which is relatively independent to the building block characteristics. With careful signal scaling, signal swings inside the loop can be suppressed to less than 50% of the reference voltage, which is h...

This paper presents a column-parallel continuous-time sigma delta (CTSD) ADC for mega-pixel resolution CMOS image sensor (CIS). The sigma delta modulator is implemented with a 2nd order resistor/capacitor-based loop filter. The first integrator uses a conventional operational transconductance amplifier (OTA), for the concern of a high power noise rejection. The second integrator is realized wit...

EVERAL CMOS OTAs suited for the design of S filters have been reported [ll-[5]. The poles and zeros of these filters are defined by the unity-gain frequencies f U , = G , / ( 2 d L ) of OTA-C integrators (G, is the transconductance of the OTA and C, is its load capacitance). Usually G, is tunable over a sufficient range to compensate for processand temperature-dependent errors. However, the tun...

This paper proposes a 300 mA low-dropout (LDO) regulator using an I Q of only 0.94 μA, which has the advantage minimizing power consumption in standby mode battery-based system. The LDO uses source follower buffer with dynamic biasing to maintain loop stability and load transient response perfor...

In this work, an ultra-low-voltage (ULV) technique to improve body-driven current mirrors is proposed. The proposed employed the performance of conventional differential-to-single-ended (D2S) converters which at these low voltages suffer from a common-mode rejection ratio (CMRR). addition, aims D2S also under large signal swing and with respect process, voltage temperature (PVT) variations, res...

Reading out analog sensor outputs can be a challenging task at low frequencies because of the frequency noise. To obtain signal clearly, special interface circuits are required. By using such circuits, signals cleaned from offset, drift and 1/f Besides, if circuitry is configurable, it possible to inputs different ranges. At block, output moved band where noise effects not dominant by chopping ...