Ultra-Low Power Quadrature LO-Generator

  • Yu Hwan Shin
  • Young Hyun Lim
  • Sun Eui Park
  • Ju Yeop Kim
  • Joo Eun Bang
  • Jae Hyouk Choi
Keywords: LC-VCO, LO-generator, Loop-gain stabilizer, Low-Dropout(LDO) regulator, Parallel amplifier


This work presents an ultra-low power quadrature local oscillation (LO) generator for mobile transceivers using a low-dropout (LDO) regulator and low noise voltage-controlled oscillator (VCO). Using a loop-gain stabilizer in LDO, the gain of the error amplifier can be constant in a wide range of load current or reference voltage. The LDO achieves high PSR and fast transient-response. Since the proposed LDO is based on the gate-pole dominant, it can be integrated on-chip. For low phase noise, NMOS-type LC-VCO is used. To reduce phase noise, a tail inductor was added. The LDO using a loop-gain stabilizer shows a fast response of 138 ns and a high PSR of −70 dB at 10 kHz to 1 MHz offset frequency, regulating output at 1.0 V with a 1.1 V supply voltage. The VCO shows a frequency range of 7.675 GHz to 12.301 GHz with a power consumption of 10 mW to 12 mW at a regulated supply of 1.0 V.

How to Cite
Shin, Y. H., Lim, Y. H., Park, S. E., Kim, J. Y., Bang, J. E., & Choi, J. H. (2021). Ultra-Low Power Quadrature LO-Generator. Journal of Integrated Circuits and Systems, 8(1). Retrieved from http://jicas.idec.or.kr/index.php/JICAS/article/view/82