Newly Proposed Duty-generator-less Passive Down-conversion Mixer

Kim, Jin–Yong; Kim, Young‐Jin; Han, Joon-Hwan; Shin, Jungho; Cho, on Sik

doi:10.5573/jsts.2019.19.4.426

Cited by 1 publication

(3 citation statements)

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“…The current flowing between the I- and Q-paths passes through the channel of the switching transistor, creating additional flicker noise. For this reason, the mixer was devised to be driven with a 25% duty cycle to prevent the I- and Q-paths from being turned on at the same time, and the generation of such additional flicker noise was suppressed [ 10 ].…”

Section: Design Of the Proposed Transceivermentioning

confidence: 99%

“…The final noise figure is only represented by the internal resistance of the input source (

), the on−resistance of the mixer (

), and the feedback resistance of the TIA (

). Therefore, the noise figure for mixer with 25% duty cycle is significantly improved compared to that with a 50% duty cycle [ 10 , 11 , 12 ]. The 1st mixer operates with 50% duty cycle used for pulse mode, on the contrary, the 2nd mixer operates with 25% duty cycle used for FMCW and CW modes.…”

Section: Design Of the Proposed Transceivermentioning

confidence: 99%

“…Section 3 explains the proposed transceiver, and describes the principle of suppressing LO leakage by applying an 8-bit current DAC to the baseband of the transmitter [ 9 ]. We also describe the proposed receiver, by analyzing the direct conversion and a double conversion structures with image rejection and explain about DC offset rejection [ 10 , 11 , 12 , 13 , 14 ]. In Section 4 , simulation results of the designed transceiver is shown.…”

Section: Introductionmentioning

confidence: 99%

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RF Transceiver for the Multi-Mode Radar Applications

Noh

Lee

et al. 2021

Sensors

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In this work, a multi-mode radar transceiver supporting pulse, FMCW and CW modes was designed as an integrated circuit. The radars mainly detect the targets move by using the Doppler frequency which is significantly affected by flicker noise of the receiver from several Hz to several kHz. Due to this flicker noise, the long-range detection performance of the radars is greatly reduced, and the accuracy of range to the target and velocity is also deteriorated. Therefore, we propose a transmitter that suppresses LO leakage in consideration of long-range detection, target distance, velocity, and noise figure. We also propose a receiver structure that suppresses DC offset due to image signal and LO leakage. The design was conducted with TSMC 65 nm CMOS process, and the designed and fabricated circuit consumes a current of 265 mA at 1.2 V supply voltage. The proposed transmitter confirms the LO leakage suppression of 37 dB at 24 GHz. The proposed receiver improves the noise figure by about 20 dB at 100 Hz by applying a double conversion architecture and an image rejection, and it illustrates a DC rejection of 30 dB. Afterwards, the operation of the pulse, FMCW, and CW modes of the designed radar in integrated circuit was confirmed through experiment using a test PCB.

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Section: Design Of the Proposed Transceivermentioning

confidence: 99%

“…The final noise figure is only represented by the internal resistance of the input source (

), the on−resistance of the mixer (

), and the feedback resistance of the TIA (

Section: Design Of the Proposed Transceivermentioning

confidence: 99%