This paper introduces a switched-voltage delay cell with differential inputs. It can be used as a building block for a range of analogue functions such as voltage-to-frenquency converter, A/D converter, etc. Applications incorporating the delay cell are presented. The performances are verified by simulations on PSpice.

It is shown that the previously reported time series analysis using a finite element approximation to the Perron-Frobenius operator can be used to investigate periodic chaos in one-dimensional discrete dynamical systems as well as mixing chaos.

In this letter, two OTAs with MOSFETs operating in the weak inversion region are proposed. One of the OTAs uses the exponential-logarithm transformation algorithm. Furthermore, the other realizes the high-linearity characteristics due to a small fluctuation of the common-terminal voltage of differential pair. The performance of the proposed OTAs was confirmed by HSPICE simulation.

A novel SC (Switched-Capacitor) offset- and gain-compensated sample/hold circuit is presented. It is implemented by a new topology which reduces the effects due to the imperfections of op-amp. Simulation results indicate that the circuit achieves high accuracy without requiring high-quality components.

An efficient algorithm is given for systematically calculating several statistics such as the invariant measure, the Kolmogorov-Sinai entropy, the autocorrelation function and the power spectrum of chaos in one-dimensional discrete dynamical systems defined by a map. The method is based on the Galerkin approximation to the Frobenius-Perron integral operator. Several numerical examples demonstrate that the proposed method can give approximations with high accuracy to the statistics of various one-dimensional chaos with the absolutely continuous invariant measure under the map.

In this paper, a low-voltage, wide-common-mode-range and high-CMRR OTA is presented. The proposed OTA consists of two circuit blocks; one is the input stage and operates as a differential level shifter, and the other is a highly linear output stage. Furthermore, the OTA can be operated in both weak and strong inversion regions. The proposed OTA is evaluated through Star-HSPICE with 0.18 µm CMOS device parameters (LEVEL53). Simulation results demonstrate a CMRR of 158 dB, a common-mode-input-range of 65 mV to 720 mV and a current consumption of 1.2 µA when VDD=0.8 V.