A supply pushing reduction technique for LC oscillators based on ripple replication and cancellation

Yue Chen (Corresponding author), Yao Hong Liu, Zhirui Zong, Johan Dijkhuis, Guido Dolmans, Robert Bogdan Staszewski, Masoud Babaie

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In this paper, we propose a method to suppress supply pushing of an LC oscillator such that it may directly operate from a switched-mode dc-dc converter generating fairly large ripples. A ripple replication block (RRB) generates an amplified ripple replica at the gate terminal of the tail current source to stabilize the oscillator's tail current and thus its oscillating amplitude. The parasitic capacitance of the active devices and correspondingly the oscillation frequency are stabilized in turn. A calibration loop is also integrated on-chip to automatically set the optimum replication gain that minimizes the variation of the oscillation amplitude. A 4.9-5.6-GHz oscillator is realized in 40-nm CMOS and occupies 0.23 mm² while consuming 0.8-1.3 mW across the tuning range (TR). The supply pushing is improved to <1 MHz/V resulting in a low <-49-dBc spur due to 0.5-12-MHz sinusoidal supply ripples as large as 50 mVpp. We experimentally verify the effectiveness of the proposed technique also in face of saw-tooth, multi-tone, and modulated supply ripples.

LanguageEnglish
Pages240-252
JournalIEEE Journal of Solid-State Circuits
Volume54
Issue number1
DOIs
StatePublished - 1 Jan 2019

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Capacitance
Tuning
Calibration

Keywords

  • Common-mode resonance
  • current-biased oscillator
  • dc-dc converter
  • Delays
  • digitally controlled oscillator (DCO)
  • foreground calibration
  • Frequency conversion
  • LC oscillator
  • Logic gates
  • Oscillators
  • power supply rejection (PSR)
  • ripple replication and cancellation
  • supply pushing
  • Switches
  • Tracking loops
  • Transistors
  • voltage-controlled oscillator (VCO).

Cite this

Chen, Yue ; Liu, Yao Hong ; Zong, Zhirui ; Dijkhuis, Johan ; Dolmans, Guido ; Staszewski, Robert Bogdan ; Babaie, Masoud. / A supply pushing reduction technique for LC oscillators based on ripple replication and cancellation. In: IEEE Journal of Solid-State Circuits. 2019 ; Vol. 54, No. 1. pp. 240-252
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abstract = "In this paper, we propose a method to suppress supply pushing of an LC oscillator such that it may directly operate from a switched-mode dc-dc converter generating fairly large ripples. A ripple replication block (RRB) generates an amplified ripple replica at the gate terminal of the tail current source to stabilize the oscillator's tail current and thus its oscillating amplitude. The parasitic capacitance of the active devices and correspondingly the oscillation frequency are stabilized in turn. A calibration loop is also integrated on-chip to automatically set the optimum replication gain that minimizes the variation of the oscillation amplitude. A 4.9-5.6-GHz oscillator is realized in 40-nm CMOS and occupies 0.23 mm² while consuming 0.8-1.3 mW across the tuning range (TR). The supply pushing is improved to <1 MHz/V resulting in a low <-49-dBc spur due to 0.5-12-MHz sinusoidal supply ripples as large as 50 mVpp. We experimentally verify the effectiveness of the proposed technique also in face of saw-tooth, multi-tone, and modulated supply ripples.",
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A supply pushing reduction technique for LC oscillators based on ripple replication and cancellation. / Chen, Yue (Corresponding author); Liu, Yao Hong; Zong, Zhirui; Dijkhuis, Johan; Dolmans, Guido; Staszewski, Robert Bogdan; Babaie, Masoud.

In: IEEE Journal of Solid-State Circuits, Vol. 54, No. 1, 01.01.2019, p. 240-252.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Chen,Yue

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AB - In this paper, we propose a method to suppress supply pushing of an LC oscillator such that it may directly operate from a switched-mode dc-dc converter generating fairly large ripples. A ripple replication block (RRB) generates an amplified ripple replica at the gate terminal of the tail current source to stabilize the oscillator's tail current and thus its oscillating amplitude. The parasitic capacitance of the active devices and correspondingly the oscillation frequency are stabilized in turn. A calibration loop is also integrated on-chip to automatically set the optimum replication gain that minimizes the variation of the oscillation amplitude. A 4.9-5.6-GHz oscillator is realized in 40-nm CMOS and occupies 0.23 mm² while consuming 0.8-1.3 mW across the tuning range (TR). The supply pushing is improved to <1 MHz/V resulting in a low <-49-dBc spur due to 0.5-12-MHz sinusoidal supply ripples as large as 50 mVpp. We experimentally verify the effectiveness of the proposed technique also in face of saw-tooth, multi-tone, and modulated supply ripples.

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