Switched currents-a new technique for analog sampled-data signal processing

Dynamic sensor compensation using analogue adaptive filter compatible with digital technology

“…The SI technique exploits the parasitic capacitance, C gs , at the gate of a MOS transistor to maintain its drain current [13]. The current memory cell of Fig.3-a has one transistor M 1 and three switches, which are driven by the clock waveforms shown in Fig.3-b and operates as follows.…”

“…Therefore, with reference to Figs.6 and using (12), to have an adaptive compensation filter, a current multiplier block with the following relationship between its input and output is required. (13) where I in is input to the filter (output of the sensor), I o is output of the filter and I α 6 is the current required for the second integrator in the filter (Fig.5). The implementation of (13) with CM OS transistors is discussed next.…”

“…Combination of (16), (17), (18) and (15) yeilds: (13), respectively and making the third and fourth terms of (19) equal to zero, because there is no constant term and a term proportional to I o in (13).…”

Current Conveyor: Novel Universal Active Block

“…It consists of an operational amplifier and external PNP transistors. A second generation current conveyor (CCII) was presented in 1990 using an operational amplifier and external CMOS transistors [4]. Both circuits were subject to the OP-AMP performance and again to the transistor mismatching.…”

CFA‐based grounded‐capacitor operational simulation of ladder filters

“…They are also suitable for monolithic integrated filters immune to unpredictable variations of process parameters [8]. Recently CM (current mode) signal processing techniques are recognized to offer potential advantages for applications in both the continuous-time and sampled-data signal processings [9][10][11][12][13][14][15][16]. CM filters have received a wide attention due to their wide bandwidth, low-voltage operation and simple implementation of signal operations, such as addition and subtraction [5,10].…”