# US 11,079,415 B2 · Peak detector calibration

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- Number: US 11,079,415 B2
- Document ID: US11079415B2
- Status: Granted
- Kind: B2
- Application number: 16/520,978
- Filed: 2019-07-24
- Published: 2021-01-28
- Granted: 2021-08-03
- Earliest claimed: 2019-07-24
- Assignees: Infineon Technologies AG
- Applicants: Infineon Technologies AG
- Inventors: Matteo Bassi; Giovanni Boi; Dmytro Cherniak; Fabio Padovan
- Web page: https://patentgrep.com/patent/US11079415B2

## CPC

- G01R 19/04: Measuring peak values {or amplitude or envelope} of AC or of pulses
- H03B 5/1265: {switched capacitors}
- G01R 35/005: {Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence)}
- H03B 5/1212: {the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair}
- H03B 5/1228: {the amplifier comprising one or more field effect transistors}
- H03B 5/1234: {and comprising means for varying the output amplitude of the generator (H03B5/1278 takes precedence)}
- H03B 5/1271: {the frequency being controlled by a control current, i.e. current controlled oscillators}
- H03B 5/1278: {the parameter being an amplitude of a signal, e.g. maintaining a constant output amplitude over the frequency range}
- H03L 5/00: Automatic control of voltage, current, or power
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H)
- H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B)

## Abstract

A calibration circuit for calibrating a peak detector configured to detect a signal peak amplitude of an oscillator, including: a calibration oscillator configured to be supplied by at least two different supply voltages to generate respective calibration signals; a calibration peak detector configured to detect a calibration signal peak amplitude of each of the calibration signals; and a logic circuit configured to calibrate the peak detector based on the detected calibration signal peak amplitudes.

## Claims

### Claim 1

A calibration circuit for calibrating a peak detector configured to detect a signal peak amplitude of an oscillator, comprising:
a calibration oscillator configured to be supplied by at least two different supply voltages to generate respective calibration signals;
a calibration peak detector configured to detect a calibration signal peak amplitude of each of the calibration signals; and
a logic circuit configured to calibrate the peak detector based on the detected calibration signal peak amplitudes.

### Claim 2 (depends on 1)

The calibration circuit of claim 1, wherein the logic circuit is configured to determine a gain of the calibration peak detector based on an interpolation of the detected calibration signal peak amplitudes, and calibrate the peak detector based on the determined gain.

### Claim 3 (depends on 1)

The calibration circuit of claim 1, further comprising:
an analog-to-digital converter configured to sample and convert outputs of the calibration peak detector and the peak detector and provide the sampled and converted outputs to the logic circuit.

### Claim 4 (depends on 1)

The calibration circuit of claim 1, wherein the calibration peak detector is a replica of the peak detector.

### Claim 5 (depends on 1)

The calibration circuit of claim 1, wherein the calibration oscillator is an inductor capacitor based oscillator.

### Claim 6 (depends on 1)

The calibration circuit of claim 1, further comprising:
a supply voltage regulator configured to generate the at least two different supply voltages.

### Claim 7 (depends on 6)

The calibration circuit of claim 6, wherein the supply voltage regulator is configured to supply the calibration oscillator with two different supply voltages to derive a linear transfer function of a gain of the calibration peak detector.

### Claim 8 (depends on 6)

The calibration circuit of claim 6, wherein the supply voltage regulator is configured to supply the calibration oscillator with more than two different supply voltages to derive a nonlinear transfer function of a gain of the calibration peak detector.

### Claim 9 (depends on 1)

The calibration circuit of claim 1, further comprising:
a memory comprising a lookup table configured to store the detected calibration signal peak amplitudes.

### Claim 10 (depends on 1)

The calibration circuit of claim 1, wherein the oscillator and the calibration oscillator are of different oscillator types.

### Claim 11 (depends on 1)

The calibration circuit of claim 1, wherein the calibration oscillator comprises a Complementary Metal Oxide Semiconductor (CMOS) oscillator, an inductor capacitor based oscillator, or a ring oscillator.

### Claim 12 (depends on 1)

The calibration circuit of claim 1, wherein the logic circuit is configured to adjust a control word of a programmable current source of the oscillator to control the signal peak amplitude of the oscillator.

### Claim 13

An oscillator circuit, comprising:
an oscillator configured to generate a signal;
a peak detector configured to detect a signal peak amplitude of a signal of the oscillator;
a supply voltage regulator configured to generate at least two different supply voltages;
a calibration oscillator configured to be supplied by the at least two different supply voltages to generate respective calibration signals;
a calibration peak detector configured to detect a calibration signal peak amplitude of each of the calibration signals; and
a logic circuit configured to determine a gain of the calibration peak detector based on an interpolation of the detected calibration signal peak amplitudes, and calibrate the oscillator through the peak detector based on the determined gain.

### Claim 14 (depends on 13)

The oscillator circuit of claim 13, wherein the oscillator, the peak detector, the calibration oscillator and the calibration peak detector are integrated on a same semiconductor chip.

### Claim 15 (depends on 13)

The oscillator circuit of claim 13, further comprising:
an analog-to-digital converter configured to sample and convert outputs of the calibration peak detector and the peak detector and provide the sampled and converted outputs to the logic circuit.

### Claim 16 (depends on 13)

The oscillator circuit of claim 13, further comprising:
a programmable current source configured to supply current to the oscillator,
wherein the logic circuit is configured to adjust a control word of the programmable current source based on the detected signal peak amplitude of the oscillator.

### Claim 17

A calibration method for calibrating a peak detector configured to detect a signal peak amplitude of an oscillator, the calibration method comprising:
generating at least two different supply voltages;
generating, by a calibration oscillator supplied by the at least two different supply voltages, respective calibration signals;
detecting a calibration signal peak amplitude of each of the calibration signals; and
calibrating the peak detector based on the detected calibration signal peak amplitudes.

### Claim 18 (depends on 17)

The calibration method of claim 17, further comprising:
sampling and converting outputs of the calibration peak detector.

### Claim 19 (depends on 17)

The calibration method of claim 17, further comprising:
supplying the calibration oscillator with more than two different supply voltages; and
deriving a nonlinear transfer function of a gain of a calibration peak detector.

### Claim 20 (depends on 17)

The calibration method of claim 17, further comprising:
adjusting a control word of a programmable current source of the oscillator to control the signal peak amplitude of the oscillator.