Yong-Seok Hwang

A controllable variable gain LNA for 2 GHz band

A variable gain LNA with large and continuous gain variation is proposed. By adding a simple gain-control loop at the second stage of a cascade LNA, a continuous gain tuning range of 28 dB is achieved. The maximum gain and NF of the LNA are 19 dB and 2.1 dB, respectively, while the DC power consumption is 13.5 mW.

A Low Power Folded RF Front-end with Low Flicker Noise for Direct Conversion Receiver

This paper presents the implementation and performance measurements of RF front-end to reduce the flicker noise and power consumption in TSMC 0.18 mum process for 2.4 GHz ISM band. The proposed RF front-end is composed of folded mixers and differential low noise amplifiers (LNA). Gilbert-cell mixers using the folded technique have been designed for low flicker noise and low power consumption. The proposed RF front-end is implemented by using PMOS devices in switching stage of mixers with a resonating inductor for low flicker noise. The proposed RF front-end consumes 7.34 mW from 1.2 V supply voltage, while conversion gain of 23 dB is achieved. The IIP3 is -7.4 dBm, and the proposed RF front-end has good linearity. Flicker noise of 10 dB at 1 kHz is acceptable value, and thus proposed RF front-end can be used in direct conversion receiver for a narrow bandwidth.

A Low Power Folded RF Front-End with Merged LNA and Mixer for ZigBee/Bluetooth

A folded RF front-end with merged LNA and mixer is designed in 0.25 mum CMOS process for low power applications. The designed low power RF front-end uses the folded and current reuse techniques. It consumes 13.8 mW from 1.7 V supply voltage, while 5.2 dB NF and 25.7 dB conversion gain are achieved. By using PMOS in the switching stage of the folded mixer, low flicker noise of 7 dB at 10 kHz is also achieved. The proposed RF front-end can be used in direct conversion receiver for a relatively narrow bandwidth system

A Folded RF Front-end with Low Flicker Noise for Bluetooth and ZigBee application

This paper presents the designed and implemented RF front-end to reduce the flicker noise and power consumption in TSMC 0.18 mum process. The proposed RF front-end is composed of folded mixer and differential low noise amplifier (LNA). To minimize flicker noise, the proposed RF front-end is designed by using PMOS devices in switching stage of mixers with an resonating inductor. For low power consumption, transconductance stage and switching stage of mixers are designed with folded architecture, and LNA and transconductance stage of mixer are designed with current reused architecture for small current flow. The proposed RF front-end consumes 7.34 mW from 1.2 V supply voltage, while conversion gain of 23 dB is achieved. The IIP3 is -7.4 dBm, and the proposed RF front-end has good linearity. Flicker noise of 10 dB at 1 kHz is acceptable value, and thus proposed RF front-end can be used in direct conversion receiver for a narrow bandwidth.

A Low Flicker Noise RF Front-end with Resonating Inductor for 2.4 GHz ISM Band

This paper presents the implementation and performance measurements of RF front-end to reduce the flicker noise and power consumption in TSMC 0.18 um process for 2.4 GHz ISM band. Folded mixers and differential low noise amplifiers (LNA) constitute the proposed RF front-end. Gilbert-cell mixers using the folded technique have been designed for low flicker noise and low power consumption. The folded mixers are implemented by using PMOS devices in switching stage of mixers with a resonating inductor for low flicker noise. The proposed RF front-end consumes 7.34 mW from 1.2 V supply voltage, while conversion gain of 23 dB is achieved. The IIP3 is -7.4 dBm, and the proposed RF front-end has good linearity. By using PMOS devices and folded technique, low flicker noise of 10 dB at 1 kHz is achieved, and thus proposed RF front-end can be used in direct conversion receiver for a narrow bandwidth.