22.5 dB open-loop gain, 31 kHz GBW pseudo-CMOS based operational amplifier with a-IGZO TFTs on a flexible film

Metal oxide semiconductor thin-film transistors for flexible electronics

“…42(a) and 43). 81,106,113,212,213,305,313,[318][319][320][321]323,329 The dynamic performance of a common-source amplifier (and of any other type of amplifier) is evaluated using the so-called Bode plot (amplitude and phase) shown in Figs. 46(a) and 46(b), which is a standard format for plotting the circuit frequency response.…”

“…212 whereas the largest occupied area is of 9.83 mm 2 (also shown for an operational amplifier constituted by 13 IGZO TFTs). 313 To date, the variety of flexible metal oxide semiconductor-based analog circuits reported ranges from single-to multiple-stage (e.g., commonsource, 113 transimpedance, 329 differential, 80,323 cascode, 318,321 operational, 212,313 and Cherry-Hooper 319 ) amplifiers, which at the same time often also include biasing circuits like current mirrors. 212 Similarly, new analog functions such as antenna channel select circuits, 337 X-ray readout circuits, 338 and digital to analog converters (DAC) 339 have been implemented recently.…”

“…318 A second version of this cascode amplifier shows a higher DC gain (25 dB) at the cost of a lower cut-off frequency of 220 kHz, consuming 2.32 mW power at 6 V. 321 Even more TFTs (13 IGZO devices) have been utilized in an operational amplifier with a GBWP of 31 kHz and an open-loop gain G OL of 22.5 dB, resulting in a f c ¼ 5.6 kHz. 313 Furthermore, this operational amplifier consumes 160 lW power during standard operation. 313 Similarly, Shabanpour et al showed a 2-stage Cherry-Hooper amplifier yielding a DC gain of 33 dB at a cutoff frequency of 400 kHz, resulting in a GBWP of 18.5 MHz based on IGZO TFTs.…”

“…313 Furthermore, this operational amplifier consumes 160 lW power during standard operation. 313 Similarly, Shabanpour et al showed a 2-stage Cherry-Hooper amplifier yielding a DC gain of 33 dB at a cutoff frequency of 400 kHz, resulting in a GBWP of 18.5 MHz based on IGZO TFTs. 319 The Cherry-Hooper amplifier (supplied at 6 V) consumes 4.96 mW power.…”

Analogue Frontend Amplifiers for Bio-Potential Measurements Manufactured With a-IGZO TFTs on Flexible Substrate

“…Analogue building blocks such as amplifiers have been already shown [13] - [18], and also DACs [19], and logic circuits [11]. On the other hand, some other basic blocks are still not available.…”