Abstract
This brief presents a hybrid of voltage- and current-mode line drivers for the turbo controller area network (CAN). The current-mode scheme prevents signal attenuation caused by source termination resistors, and it enhances signal power efficiency. On top of that, an adaptive amplitude tuning is implemented to mitigate non-linearity and closed-loop gain variations against load impedance variations. The proposed line driver achieves 87.0% power-efficiency and total harmonic distortion, plus noise (THD+N) of −49.0 dB at an input frequency of 40 MHz and output swing of 2.8 VPP differential. The adaptive amplitude tuning allows load impedance variations from 80 Ω to 160 Ω. The total power consumption is 37.6 mW with a 1.8 V supply voltage in 180 nm CMOS, and it occupies 0.377 mm2.
Highlights
Introduction and CurrentMode Line Driver withLine drivers (LDs) have been widely used in various wire-lined channels, such as integrated service digital network (IDSN) transceivers, digital subscriber line (DSL), and cable modems [1]
A fully differential difference Voltage-mode line drivers (VMLDs) with a dual common-mode feedback (CMFB) circuit [7] allows a faster transient response, which results in an improved linearity
Another VMLD assisted with an active termination circuit and dynamic power supply control circuit [3] allows enhanced power efficiency
Summary
Line drivers (LDs) have been widely used in various wire-lined channels, such as integrated service digital network (IDSN) transceivers, digital subscriber line (DSL), and cable modems [1]. A fully differential difference VMLD with a dual common-mode feedback (CMFB) circuit [7] allows a faster transient response, which results in an improved linearity Another VMLD assisted with an active termination circuit and dynamic power supply control circuit [3] allows enhanced power efficiency. The output stage of a current-mode H-bridge cascode, assisted with local auxiliary loops [8], enhances mirroring accuracy to alleviate the signal linearity. It requires additional circuits and power consumption for the auxiliary amplifiers, and the cascode topology reduces the allowable output signal swings.
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