Voltage source and method for calibrating this voltage source

Patent metadata

Field	Value
Publication number	US-12431906-B2
Application number	US-202118026758-A
Country	US
Kind code	B2
Filing date	Sep 17, 2021
Priority date	Sep 17, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Embodiments of the present disclosure provide a pixel circuitry, a drive method thereof, an array substrate and a display panel. The pixel circuitry includes circuits designated: drive C D , data write C DW , initialization C I , first light emission control C LEC1 , first storage C S1 , second storage C S2 and second light emission control C LEC2 . C D connects to first through third nodes N 1 -N 3 and provides drive current to a light emitting device. C DW connects to N 1 and provides a data signal to C D according to a drive signal. C I provides an initialization signal to N 2 according to a reset signal. C LEC1 provides a first voltage signal to N 3 according to a first light emission control signal. C S1 and C S2 store a voltage difference between the first voltage signal terminal and N 2 , and N 1 and N 2 , respectively. C LEC2 controls the drive current to the light emitting device according to a second light emission control signal.

First claim

The invention claimed is:

1. An electrical voltage source comprising:
an integrated circuit including
a first input terminal and a second input terminal configured to receive an electrical control signal,
a first output terminal and a second output terminal configured to provide an output voltage, and
a junction module including at least one Josephson junction and that is coupled to the first and second input terminals and to the first and second output terminals such that the value of the output voltage depends on the frequency of the electrical control signal;

a cryogenic module configured to maintain the integrated circuit in conditions in which the integrated circuit is in a superconducting state;
a microwave generator coupled to the first and second input terminals and configured to produce the electrical control signal; and
an adjustment module configured to adjust the amplitude of the electrical control signal as a function of its frequency according to a predetermined rule,
wherein the predetermined rule includes the association of at least certain frequency values of the control signal with a respective optimum amplitude value using a lookup table, the adjustment module being configured to make the voltage source pass from a first configuration, in which the control signal has a first frequency value and a first optimum amplitude value corresponding to the lookup table, to a second configuration in which the control signal has a second frequency and a second optimum amplitude value corresponding to the lookup table.

2. The voltage source according to claim 1 , wherein the predetermined rule includes the association of at least certain frequency values of the control signal with a respective optimum amplitude value.

3. The voltage source according to claim 1 , wherein the adjustment module is configured to adjust the frequency of the electrical control signal in a predetermined frequency band.

4. The voltage source according to claim 3 , wherein the predetermined frequency band has a width of at least 5 GHZ.

5. The voltage source according to claim 1 , wherein the adjustment module is configured to adjust the frequency of the electrical control signal with an adjustment pitch lower than or equal to 100 KHz.

6. The voltage source according to claim 1 , wherein the junction module is coupled to the first and second input terminals via a wide-band coupling circuit.

7. The voltage source according to claim 6 , wherein the adjustment module is configured to adjust the frequency of the electrical control signal in a predetermined frequency band and the wide-band coupling circuit includes an electric path that couples the junction module to the first and second input terminals and whose length is lower than the wavelength of the control signal in the integrated circuit, at the maximum frequency of said predetermined frequency band.

8. The voltage source according to claim 1 , wherein the first input terminal and the second input terminal are coupled to the microwave generator via a microwave transmission line.

9. The voltage source according to claim 1 , wherein the junction module includes a first junction electrode coupled to the first output terminal and coupled to the first input terminal via a first decoupling capacitor, and a second junction electrode coupled to the second output terminal and coupled to the second input terminal via a second decoupling capacitor.

10. The voltage source according to claim 1 , wherein the junction module includes a plurality of Josephson junctions.

11. The voltage source according to claim 10 , wherein at least two junctions of the plurality of junctions are mounted in parallel.

12. The voltage source according to claim 10 , wherein at least two junctions of the plurality of junctions are mounted in series.

13. The voltage source according to claim 1 , wherein the adjustment module is configured to interpolate an intermediate amplitude value as a function of at least two amplitude values associated with consecutive frequency values in the lookup table.

14. A method for calibrating the voltage source according to claim 1 , the method comprising:
for each frequency of a set of frequencies of the control signal, determining an optimum amplitude of the control signal for which a Shapiro current of the junction module is non-zero, and establishing a predetermined rule for associating each frequency with a corresponding optimum amplitude,
wherein the predetermined rule includes the association of the certain frequency values of the control signal with the respective optimum amplitude value using the lookup table.

15. The calibration method according to claim 14 , wherein the Shapiro current is a Shapiro current of order 1.

16. The method according to claim 15 , wherein the determining the optimum amplitude includes
polarizing the junction module such that the output voltage is zero and that a non-zero current passes through the junction module,
measuring the output voltage, the measurement being characterized by a measurement uncertainty,
determining a minimum amplitude value of the control signal at which the output voltage varies with a predetermined amplitude, and
applying a predetermined coefficient to said minimum amplitude value in order to obtain said optimum amplitude.

17. The method according to claim 16 , wherein the predetermined amplitude is at least equal to four times the measurement uncertainty.

18. The method according to claim 14 , wherein said frequencies of the set of frequencies are spaced apart by a maximum of 100 MHZ.

Assignees

• Paris Sciences Et Lettres
• Centre Nat Rech Scient
• College France

Inventors

• Girit Caglar
• Smirr Jean-Loup

Classifications

• G01R33/0358

  coupling the flux to the SQUID (gradiometer coils G01R33/022; coils with superconductive winding H01F6/06) · CPC title

• G01R35/005

  Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence) · CPC title

• G01R35/007

  Standards or reference devices, e.g. voltage or resistance standards, "golden references" · CPC title

• H03K19/195 Primary

  using superconductive devices · CPC title

• G01R1/28 Primary

  Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform · CPC title