Features

This section provides an overview of the features of the HDIQ Instrument. The first subsection contains the description of the graphical overview and the hardware feature list. The following subsection details the front panel and the back panel of the HDIQ Instrument. The last section describes the product power supply and remote control.

Functional Overview

hdiq functional diagram eth di
Figure 1. HDIQ Instrument functional diagram

The HDIQ Instrument according to Figure 1 consists of several internal units (light blue color) surrounded by several interface units (dark blue color), the front panel on the left-hand side, and the back panel on the right-hand side. The arrows between the panels and the interface units indicate selected physical connections and the data flow.

Table 1. Truth table of RF switches
Operating mode Output signal RF SW11 RF SW22

RF (default)

RF (Exp.)

L

L

LO

LO (Exp.)

H

L

Calibration

RF (Calib.)

L

H

N/A

N/A

H

H

1 SW1 is the RF switch for the RF or the LO signal that goes to the Exp. output port.
2 SW2 is the RF switch for the RF signal that goes to the Calib. or to the Exp. output port.

The HDIQ IQ Modulator consists of 4 identical frequency up-conversion units. Each of them counts 3 inputs, I (in-phase), Q (quadrature) and LO (local oscillator), and two outputs, Exp. (experiment) and Calib. (calibration). The amplified and filtered up-converted signal after the IQ mixer goes either to the Calib. port for mixer calibration or to the Exp. port for qubit manipulation. The Exp. port can also output the attenuated LO signal, which can then be used for qubit spectroscopy. The operating mode (mixer calibration, RF output, or LO output) is selected by 2 RF switches controlled either by direct digital input signals for the instrument with the serial number below 14100, described in Table 1, or by a host computer via Ethernet connection for the instrument with the serial number 14100 and above, described in Connecting to the Instrument.

Key features

  • 4-channel IQ modulator

  • RF frequency range 4 - 8 GHz

  • Intermediate frequency range DC - 6 GHz

  • Experiment output port switchable between RF output and direct LO output

  • Separate output port for mixer calibration

  • AC-coupled RF circuit design preventing ground loops

  • Python programming examples for mixer calibration

Front Panel Tour

The front panel SMA connectors and control LEDs are arranged as shown in Figure 2 and listed in Table 2.

hdiq frontpanel with letters
Figure 2. HDIQ IQ Modulator front panel
Table 2. HDIQ Instrument front panel description
Position Label/Name Description

A

N/A

This multi-color LED indicates the state of the associated output.

color blue: output enabled, RF output to the Exp. port (default RF mode)

color green: output enabled, LO output to the Exp. port (LO mode)

color orange: output enabled, RF output to the Calib. port (calibration mode)

B

Calib.

calibration output port

C

Exp.

experiment output port

D

LO

local oscillator input

E

I

In-phase signal input

F

Q

quadrature signal input

Back Panel Tour

The back panel is the main interface for power and control. Please refer to Figure 3 and Table 3 for the detailed description of the items.

hdiq backpanel eth di with letters
Figure 3. HDIQ IQ Modulator back panel
Table 3. HDIQ Instrument back panel description
Position Label / Name Description

A

safety chassis gnd

4 mm banana jack connector for chassis ground, electrically connected to the chassis. In order to guarantee a controlled ground impedance of the HDIQ, the grounding cable provided must be connected to the PE terminal of the HDAWG.

B

LAN 100 Mb

100 Mbit LAN connector for connection to a host computer. Note that this is available only for the instrument with the serial number 14100 and above.

C

Digital Input

Digital input for RF switch control. The connector DB15 drawing is shown in Figure 4 and the pin description is listed in Table 4

D

USB

Universal Serial Bus (USB) 2.0 port only for static IP address configuration and maintenance. Note that this is available only for the instrument with the serial number 14100 and above.

E

N/A

Power switch

F

DC in

DC external 12 V power supply

hdiq backpanel db15
Figure 4. HDIQ IQ Modulator Digital input 15-pin connector
Table 4. Digital input pin assignment
Pin HDIQ channel RF switch

DB1

1

SW2

DB2

1

SW1

DB3

3

SW2

DB4

3

SW1

DB5

4

SW2

DB6

4

SW1

DB7

2

SW2

DB8

2

SW1

DB9

NC (SN < 14100); Enable digital input interface (SN >= 14100)

-

DB10

NC

-

DB11-DB15

GND

-

Power Supply and remote control

The HDIQ is powered by 12 V, 2 A, DC input. The AC/DC power adapter and the power cord with a power plug suited to your country are included in the product package. In order to guarantee a controlled ground impedance of the HDIQ, the grounding cable provided must be connected to the PE terminal of the HDAWG.

The HDIQ operating modes can be controlled by a host computer via Ethernet connection, or by digital input signals via a third-party digital output card with current at least 5 mA for each channel. Please find more information in Connecting to the Instrument.