Fabricated ICs



Digital and Analog Test Circuits

Design: August Arnal, Matías Miguez

Technology: NeuDrive

Year: 2016

Different Test Circuits for an Organic technology were implemented.

  1. Test devices to measure, capacitance ande resistance.
  2. Array of Test Transistors to measure spatial variance of parameters.
  3. Inverters and NANDs circuits.
  4. Power transistiors to study current distribution.
  5. Differential pairs and current mirrors.

For more information, see Publications.

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An Integrated H-Bridge Circuit In A HV Technology

Design: Bruno Bellini, Alfredo Arnaud, Stephania Rezk, Maximiliano Chiossi, Matías Miguez, Joel Gak

Technology:CEITEC XC06 0.6 μm

Year: 2016

Two different circuits were implemeted:

  1. H-Bridge Circuit In A HV Technology, for RFID applications.
  2. Test Transistors.

For more information, see Publications.

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Asic with Automatic Digital Trimming.

Design: Rafi Sahakian, Joel Gak, EAMTA

Technology:ONSEMI C5 0.5 μm

Year: 2015

Two different circuits were implemeted:

  1. A Comparator with digital trimming.
  2. EAMTA school test circuits.

A low noise comparator that initially calibrates itself automatically to reduce offset.

At the EAMTA students design their first digital circuits that are tested at the next EAMTA.


For more information, see Publications.

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Asic for flicker noise characterizarion and other circuits.

Design: Rafael Puyol, Emilio Alvarez, Alfredo Arnaud, Matías Miguez, Stephania Rezk, Sabrina Bottigelli.

Technology: XFAB XC06 0.6 μm

Year: 2013

Four different circuits were implemeted:

  1. Low power Instrumentation Amplifier.
  2. Low power Operation Amplifier.
  3. Flicker Noise Characterization Circuits, with special circuit for Cyclostationary noise Measurements.
  4. Low Power Inductive DC/DC converter.

For more information, see Publications.

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EEG and cardiac sense amplifiers.

Design: Matías Miguez Guillermo Costa, Fernando Bengoechea, Germán Aguirre, Andrés Garagorry, Ignacio Gomez, Joel Gak, Pablo Cayuela, Alfredo Arnaud

Technology: XFAB XC06 0.6 μm

Year: 2012

Five different circuits were implemeted:

  1. Active mirror Gm
  2. Low-voltage, low-power amplifier.
  3. Low-power Voltage Reference, with autozero.
  4. 10 bit low-power AD converter
  5. Nano-power clock oscillator

For more information, see Publications.

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Several Low power applications.

Design: José Lasa, Emilio Alvarez, Fernando Bengoechea, Germán Aguirre, Andrés Garagorry, Ignacio Gomez, Joel Gak, Matías Miguez, Alfredo Arnaud

Technology: XFAB XC06 0.6 μm

Year: 2011

Four different circuits were implemeted:

  1. Gm-C filter for cardiac sensing.
  2. Micro-Power Programmable Analog Front-end.
  3. Low power Voltage Reference.
  4. A low-power, low-offset Gm-C comparator.

For more information, see Publications.

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EEG and cardiac sense amplifiers.

Design: Guillermo Costa, Nicolás Giménez, José Lasa, Matías Miguez, Alfredo Arnaud

Technology: XFAB XC06 0.6 μm

Year: 2010

Two different circuits were implemeted:

  1. A low-noise Autozero amplifier aimed to EEG signal recording.
  2. A fully integrated preamplifier for cardiac sensing.

The use of the SCTF theory within the operation of an Autozero amplifier as a way of reducing the noise aliasing effect in amplifiers with low frequency ranges.


A novel fully integrated preamplifier stage for cardiac activity sensing was fabricated. The proposed design takes advantage of the High Voltage CMOS technology properties to comply with the safety requirements of implantable devices without the addition of external decoupling capacitors. The power consumption is minimum; while the input referred noise is kept well below the minimum signal to be sensed. This first stage is a high pass filter with a cut off frequency at 75Hz, and 25db gain.


For more information, see Publications.

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Integrated Programmable Current Source, Low power Miller.

Design: Julio Suárez, Juan Osta, Matías Miguez, Alfredo Arnaud

Technology:ONSEMI C5 0.5 μm

Year: 2009

Two different circuits were implemeted:

  1. A programmable current source for medical devices.
  2. A low power, low noise miller.

The 8-bits programmable current, can provide currents from 150 μA to 37 mA, with a step of 150 μA. The source must work with stimulation voltages from close to zero and up to 16 V. The aim is to develop an ASIC with multiple independent stimulation electrodes, each of them able to drain a programmable current to ground from a biological tissue.

A miller amplifier for ENG signal amplification, with an input reffered noise of 0.65 μVrms in the band of interest, and a power compsumption of 1 mW.


For more information, see Publications.

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Integrated switches for tissue stimuli.

Design: Joel Gak, Matías Miguez, Alfredo Arnaud

Technology: XFAB XT06 0.6 μm

Year: 2008

Three different integrated switches (Switch A, B and C) to control either voltage (100mV-16V), or current (100µA-30mA), stimuli. The switches can be used in a large spectrum of devices, either at prototype level, or in small production batches. The designed switches are composed of large size MOS pass transistors and a complex circuitry for MOS gates control and voltage level adaptation. Some specifications were:

  1. On resistance below 5Ω.
  2. Negligible static power consumption (few tens nA maximum).
  3. Support voltage stimuli from 100mV to 16V and current stimuli form 10μA to 30mA.
  4. Safety, the failure of a single circuit element (for example a punctured MOS gate) must not cause a DC current flow through to the electrodes in contact with the tissue, larger than a few microamperes because otherwise it may be a risk for the patient..

For more information, see Publications.

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Low noise chopper amplifier for EEG, test circuits for mismatch measurements & 10 nA Current source

Design: Matías Miguez, Joel Gak, Renato Campana, Alfredo Arnaud

Technology: TSMC 0.35 μm

Year: 2007

Description: The fabricated chip contains 3 different analog circuit designs.

  1. Chopper amplifier for EEG signals
  2. Test circuits for mismatch measurements
  3. 10nA Current Source

Circuits 1 is an amplifier for very low amplitude signals, like those of EEG (Electro-Encefalo-Graph) signal registration. Main characteristics are ultra low-noise, low power consumption since the circuits are intended to operate in implantable medical devices, high CMRR, among others. This circuit uses chopper modulation for flicker noise removal.

Circuits 2 are several different tes circuits for mismath measurements.

Circuits 3 is a completly integrated 10nA current source.


For more information, see Publications.

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Band-Pass Gm-C filter & Mismatch test structures

Design: Joel Gak, Martín Bremermann, Alfredo Arnaud

Technology: AMIS ABN 1.5 μm

Year: 2006

Description: The fabricated chip contains 2 different analog circuit designs.

  1. 100Hz-5kHz Band-Pass Gm-C filter
  2. Mismatch test structures

Circuit 1 correspond to a band-pass filter aimed to be included in ENG (Electro-Neuro-Graph) signal registration in implantable medical devices. Main characteristics are 100Hz-5kHz passband, ultra low-power consumption, low noise, high CMRR, among others. This circuit uses continuous time Gm-C technique.

Circuit 2, are a set of non-unitary current mirrors with a copy factor 1:64, to allow students topractice layout matching techniques, and high-precision measurement techniques. During measurements current copy error is measured for several decades of the current value.


A complete report can be found here.

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Low noise amplifier for ENG & Low noise chopper amplifier for ENG

Design: Joel Gak, Martín Bremermann, Matías Miguez, Alfredo Arnaud

Technology: AMIS ABN 1.5 μm

Year: 2005

Description: The fabricated chip contained 3 different analog circuit designs.

  1. Pre-amplifier for ENG signals
  2. DC-DC power supply
  3. Chopper pre-amplifier for ENG signals

Circuits 1 and 3 correspond to preamplifiers for very low amplitude signals, like those of ENG (Electro-Neuro-Graph) signal registration. Main characteristics are ultra low-noise, low power consumption since the circuits are intended to operate in implantable medical devices, high CMRR, among others. Circuit 1 uses continuous time techniques, while circuit 3 uses chopper modulation for flicker noise removal. Noise reduction is made in circuit 1 by lowering the voltage from the hypothetical battery, by means of a energy efficient DC-DC converter. The latter is the circuit 2.


A complete report can be found here.

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