High-linearity input buffer
AssigneeMediaTek Singapore Pte. Ltd.
InventorsTao He, Chan-Hsiang Weng, Su-Hao Wu
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Abstract
An input buffer using a frequency dependent impedance circuit to compensate for nonlinearity in low frequency is shown. In a pseudo-differential architecture, a frequency-dependent impedance circuit is coupled between the drain of a positive input transistor of the flipped voltage follower and the drain of a negative input transistor of the flipped voltage follower. In a single-ended architecture, the frequency-dependent impedance circuit is coupled between the drain of an input transistor of the flipped voltage follower and an alternating current ground. The frequency-dependent impedance circuit includes a capacitor.
Claims13
A high-linearity input buffer, comprising:
- a flipped voltage follower, configured in a pseudo-differential architecture;
- and
- a frequency-dependent impedance circuit, coupled between a drain of a positive input transistor of the flipped voltage follower and a drain of a negative input transistor of the flipped voltage follower,
- wherein the frequency-dependent impedance circuit further includes at least one resistive element coupled in series with a frequency-dependent impedance element of the frequency-dependent impedance circuit between the drain of the positive input transistor and the drain of the negative input transistor.
A high-linearity input buffer, comprising:
- a flipped voltage follower, configured in single-ended architecture;
- and
- a frequency-dependent impedance circuit, coupled between a drain of an input transistor of the flipped voltage follower and an alternating current ground,
- wherein:
- the frequency-dependent impedance circuit includes a capacitor;
- the frequency-dependent impedance circuit further includes a resistive element;
- and
- the resistive element and the capacitor are coupled in series between the drain of the input transistor and the alternating current ground.
Dependencies are inferred from the claim text.