Manuel Gonzalez

Manuel Gonzalez

He/His

Research Engineer at APC

Talks and presentations

Non multiplexed SQUID readout electronics for large detector arrays

June 05, 2025

Talk, 21st International conference on Low Temperature Detectors LTD25, Santa Fe, New Mexico, USA

We explore the optimization of single-channel SQUID readout electronics for reading out large arrays of low-temperature detectors. We specifically address the challenges associated with wiring and front-end electronics scalability. By leveraging advancements in integrated circuits for time-division multiplexing and relaxing bandwidth constraints, we demonstrate the feasibility of compact, low-power front-end electronics. Moreover, these designs could be implemented using technologies with a high technology readiness level, making them well suited for spaceborne instruments.

IN2P3 activities and developments for CMB-S4

December 04, 2023

Talk, Colloque national CMB-France #5, Paris, France

CMB-S4 is the next generation CMB instrument, led by the US. It will observe the sky from Chile and the South Pole with 500000 detectors. The large scale of the project gives rise to numerous challenges in terms of instrument design, hardware production, data management and data analysis. Several IN2P3 laboratories are involved in this project, both from the data management/analysis and instrumental point of view. In this presentation I will give an overview of these activities, which are being consolidated into a cooperative research and development agreement. In particular, I will describe the contributions to the warm analog front-end electronics of the instrument and the proposed contributions in data management, which include data movement, metadata infrastructure, data simulation and data reduction.

Fully differential broadband LNA with active impedance matching for SQUID readout

July 28, 2021

Conference proceedings talk, 19th International Workshop on Low Temperature Detectors (LTD19), Boulder, USA (rmeote)

Low noise amplifiers (LNA) are key elements in most instrument’s detector readout chains. In this paper we present the development and characterization of a differential to differential SiGe BiCMOS LNA with active impedance matching for the readout of Superconducting Quantum Interference Devices (SQUIDs). The matching impedance is particularly important when using the LNA over a wide band and it is achieved using the Miller effect by adding a negative feedback loop. This approach avoids the degradation of the noise performance that is generated by simply using a parallel resistor at the LNA input. Furthermore, this impedance matching implementation preserves the signal to noise ratio (SNR) because both, the signal signal and the noise, are divided by a factor of 2 due to the impedance matching and negative feedback loop. This was verified by measuring a lower input voltage noise with the LNA input loaded with a 100 Ω resistor at 77 K compared to a short-circuit.In addition, we present simulations and measurements of the LNA gain, input impedance and input voltage noise. The obtained performances for the LNA show a flat gain of 86 V/V with a cut-off frequency of 26 MHz and an input voltage white noise spectral density level lower than 0.5 nV/√ Hz with a corner frequency of 200 Hz. These values are in good agreement with the simulations. Finally, a discussion about the impact of the impedance matching on the SQUID biasing is also presented.