Low overhead on chip scope
AssigneeSamsung Display Co., Ltd.
InventorsDa Wei, Mohammad Hekmat, Valentin Abramzon, Amir Amirkhany
Life of this patent
Estimating the term…
Abstract
An on-chip scope and a method for operating the on-chip scope. The on-chip scope includes a provision for operating in one of two states, the effects of voltage offsets being different in the two states. A first voltage is measured in the first state, a second voltage is measured in the second state, and the two measurements are combined to generate a voltage estimate in which the effects of voltage offsets are reduced.
Claims20
A sampling circuit, comprising:
- a sampling input;
- a reference input;
- a cross-bar switch;
- and
- a differential comparator,
- the cross-bar switch being connected between:
- the sampling input and the reference input, and
- the differential comparator,
- the cross-bar switch being configured:
- in a first state of the cross-bar switch, to connect:
- the sampling input to a first input of the differential comparator, and
- the reference input to a second input of the differential comparator, and
- in a second state of the cross-bar switch, to connect:
- the sampling input to the second input of the differential comparator, and
- the reference input to the first input of the differential comparator.
A method for estimating a received voltage at a phase point in a periodic signal received at a sampling input, the phase point corresponding to a first clock phase, the method comprising:
- feeding, to a clock input of a clocked comparator, a phase-adjusted clock signal having a phase corresponding to the phase point;
- connecting the received voltage to a first input of the clocked comparator;
- connecting a reference voltage to a second input of the clocked comparator;
- determining a first estimated voltage;
- connecting the received voltage to the second input of the clocked comparator;
- connecting the reference voltage to the first input of the clocked comparator;
- determining a second estimated voltage;
- and
- calculating a corrected estimated voltage as an average of the first estimated voltage and the second estimated voltage.
A method for estimating a received voltage at a phase point in a received periodic signal received, from a node in a first portion of an analog circuit, at a sampling input, the phase point corresponding to a first clock phase, the method comprising:
- feeding, to a clock input of a clocked comparator, a phase-adjusted clock signal having a phase corresponding to the phase point;
- determining a first estimated voltage;
- pulling the node to a set voltage;
- determining a second estimated voltage;
- and
- calculating a corrected estimated voltage as a sum of:
- the set voltage and
- a difference of:
- the first estimated voltage and
- the second estimated voltage.
Dependencies are inferred from the claim text.