A 9.8-11.5-GHz quadrature ring oscillator for optical receivers

Abstract

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A very low phase noise fully integrated CMOS quadrature LC oscillator for 2.4 GHz bluetooth/WLAN applications

“…If phase noise requirements are not stringent, this option is often most convenient [9]. However, in many applications, given a realistic power budget, the phase noise specification can only be achieved with LC oscillators.…”

An LC Quadrature VCO Using Capacitive Source Degeneration Coupling to Eliminate Bi-Modal Oscillation

“…10 shows the phasor diagram of the proposed CSD-QVCO, where is defined as the phase shift between the input voltage of and its output current , and can be calculated as (5) where is the input transistor's transition frequency. According to (5), the phase shift is between 0 and 90 , and it is determined by the ratios and . Notice that the source degeneration capacitor is noiseless and does not contribute any phase noise.…”

“…Another example is found in half-rate clock and data recovery (CDR) systems [2], where quadrature signals slow down the operating speed of the most critical sampling blocks. Typical quadrature signal generation approaches include frequency divider [3], RC polyphase filter [4], quadrature voltage-controlled oscillator (QVCO) with RC load [5] or LC resonator [6]- [18]. Among them, LC-QVCO is a popular choice due to its low phase noise and low power consumption.…”

Polarization Reconfigurable Slot Antenna With a Novel Compact CPW-to-Slotline Transition for WLAN Application

“…Oscillator is the critical component in various wireless communication applications. Ring oscillator, due to the large tuning range, compact size, and scalability to next generation CMOS technologies, has become a choice for many RF circuit designers [1][2][3][4][5][6][7][8][9][10]. However, its poor phase-noise performance limits its applications in many wireless systems.…”