Four-Channel Coil Driver
ColdQuanta’s four-channel coil driver consists of four bidirectional voltage-controlled current sources designed to drive inductive loads. The output currents are directly proportional to the input voltage. Each channel is independently capable of driving up to ±3 A. All four channels have their own set of controls, indicators, inputs, and outputs. Balanced, differential inputs isolate the coil driver from control electronics.
Instrument Control System
ColdQuanta’s instrument control system is a single-box solution for providing analog and digital control signals to a variety of laboratory instruments. The system provides 20 analog outputs, 24 digital TTL outputs, a 25-pin output for programming ColdQuanta’s DDS-based frequency synthesizer, and three 1394 TTL outputs for directly driving mechanical shutters. All of the outputs are controlled via an internal FPGA that allows for real-time programming and synchronization.
The computer control system is designed to work with other ColdQuanta products for laboratory- based experiments. The system can be programmed with ColdQuanta’s control software. In addition, the analog outputs of the control system are configured for direct integration with ColdQuanta’s chip and coil drivers. The control software and system also provide seamless programming of ColdQuanta’s DDS-based frequency synthesizer.
DDS Frequency Synthesizer
ColdQuanta’s direct digital synthesis (DDS) frequency synthesizer generates RF electrical signals for evaporative cooling of magnetically trapped atoms. To simplify experiments that use evaporation, the DDS can be directly programmed to generate linear frequency ramps. Other features include:
- referencing to an external frequency for generating signals with the improved frequency stability of an atomic clock or frequency reference;
- a TTL enable/disable switch that allows fast, precise control of the output;
- direct interface with ColdQuanta’s RF antennas for evaporative cooling;
- direct interface with ColdQuanta’s hardware control system and software package for computer control and integration into time-sequence experiments.
Two Channel Atom Chip Driver
ColdQuanta’s atom chip driver consists of two bidirectional voltage-controlled current sources designed to drive two atom chip traces. The output currents are directly proportional to the input voltage, i.e. an input voltage of +1.0 V will set the output current to +1.0 A. Each channel is independently capable of driving up to ±5 A. The two channels are floating, and each has its own set of controls, indicators, inputs, and outputs. Balanced, differential inputs isolate the chip driver from control electronics. To accommodate atom chip traces that overlap, the two outputs are isolated from each other and from ground.
Z Coil Driver
ColdQuanta’s Z-coil driver is a unipolar voltage-controlled current source designed to drive an inductive load with currents up to 20 A. The output current is directly proportional to the input voltage with a transconductance of 2 A/V. Balanced, differential inputs isolate the driver from control electronics.