Title | ||
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A transimpedance amplifier using a widely tunable PVT-independent pseudo-resistor for high-performance current sensing applications. |
Abstract | ||
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In this paper, we present a pseudo-resistor-based transimpedance amplifier (TIA) whose transimpedance value is PVT-independent and continuously tuneable over a wide range. The nonlinearity of the pseudo-resistors is mitigated by connecting a large number of elements in series and the effect of process variations on the pseudo-resistor is canceled by a biasing network based on a pseudo current mirror. The design is also first order temperature compensated exploiting the PTAT behavior of the proposed pseudo-resistor and using a PTAT current reference for its biasing. The proposed architecture is verified using a prototype manufactured in a 0.18 mu m CMOS SOI technology. In this prototype, the transimpedance can be adjusted between approximately 1 M Omega and 1 G Omega. The achievable bandwidth varies inversely proportional with the transimpedance value from around 7 kHz for a value of 1 G Omega up to an opamp-limited maximum of 2 MHz. In the white region, the input referred noise is equal to that of a TIA using an equivalent ohmic resistor. A minimum value of 5 fA/root Hz is achieved for a transimpedance of 1 G Omega. Over a temperature range from -40 degrees C to 125 degrees C, the transimpedance varies less than 10% for 1 M Omega. The TIA occupies a chip area of 0.07 mm(2). At room temperature, the power consumption is 9.5 mW from a single 1.8 V supply of which the pseudo-resistor consumes 0.2 mW. |
Year | Venue | Field |
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2017 | ESSCIRC 2017 - 43RD IEEE EUROPEAN SOLID STATE CIRCUITS CONFERENCE | Capacitance,Current mirror,Computer science,Electronic engineering,Chip,Transimpedance amplifier,Bandwidth (signal processing),Resistor,Electrical engineering,Temperature measurement,Biasing |
DocType | Citations | PageRank |
Conference | 0 | 0.34 |
References | Authors | |
1 | 6 |
Name | Order | Citations | PageRank |
---|---|---|---|
Denis Djekic | 1 | 0 | 2.37 |
Georg Fantner | 2 | 5 | 3.77 |
Jan Behrends | 3 | 0 | 0.34 |
Klaus Lips | 4 | 0 | 2.37 |
Maurits Ortmanns | 5 | 501 | 114.46 |
Jens Anders | 6 | 60 | 24.75 |