Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier

MATEC Web of Conferences, Jan 2017

In this paper, a voltage mode multifunction filter based on single voltage differencing differential difference amplifier (VDDDA) is presented. The proposed filter with three input voltages and single output voltage is constructed with single VDDDA, two capacitors and two resistors. Its quality factor can be adjusted without affecting natural frequency. Also, the natural frequency can be electronically tuned via adjusting of bias current. The filter can offer five output responses, high-pas (HP), band-pass (BP), band-reject (BR), low-pass (LP) and all-ass (AP) functions in the same circuit topology. The output response can be selected by choosing the suitable input voltage without the component matching condition and the requirement of additional double gain voltage amplifier. PSpice simulation results to confirm an operation of the proposed filter correspond to the theory.

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Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier

MATEC Web of Conferences Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier Amornchai Chaichana 0 Surasak Sangyaem 0 Winai Jaikla 0 0 Department of Engineering Education, Faculty of Industrial Education, King Mongkut's Institute of Technology Ladkrabang , Thailand In this paper, a voltage mode multifunction filter based on single voltage differencing differential difference amplifier (VDDDA) is presented. The proposed filter with three input voltages and single output voltage is constructed with single VDDDA, two capacitors and two resistors. Its quality factor can be adjusted without affecting natural frequency. Also, the natural frequency can be electronically tuned via adjusting of bias current. The filter can offer five output responses, high-pas (HP), band-pass (BP), band-reject (BR), low-pass (LP) and all-ass (AP) functions in the same circuit topology. The output response can be selected by choosing the suitable input voltage without the component matching condition and the requirement of additional double gain voltage amplifier. PSpice simulation results to confirm an operation of the proposed filter correspond to the theory. 1 Introduction In analog image processing system, the filter is the main circuit that is used to separate the desired signal from undesired ones. Especially, the versatile filter called as multifunction filter has been gained significant attention and has become an interesting research topic. Because the multifunction filter can provide several filter responses in the same circuit topology [1]. The multiple inputs single output (MISO) multifunction filter belongs to popular filter structures. An important feature of this structure is the generation of several output transfer functions, i.e., high-pas (HP), band-pass (BP), band-reject (BR), lowpass (LP) and all-ass (AP) with single output node while the output response can be selected by suitable input signals. The popular way to select the input signal is to use the digital or electronic switch which is easily controlled by microcomputer or microcontroller. So, the MISO filter structure should not require the double input signal to avoid the addition al amplifier. The voltage differencing differential difference amplifier (VDDDA) is the interesting active building block. This active device consists of three subtraction /addition voltage signal terminals with electronically tunable transconductance. With this feature, it can be found the VDDDA based analog circuits in the literature for examples, first order voltage mode filter [2], sinusoidal oscillator [2], inductance simulator [4], single input multiple output voltage mode filter [5]-[6], multiple input multiple output voltage mode filter [7] etc. Recently, the VDDDA based three inputs single output voltage mode multifunction filter [8] was published. This filter is attractive because it is minimum number of active element consisting of single VDDDA, single resistor and two capacitors. The natural frequency and quality factor can be electronically controlled. However, the inverting double gain voltage amplifier is required for getting the all-pass response. In this paper, a voltage mode multifunction filter based on single voltage differencing differential difference amplifier (VDDDA) is proposed. The filter with three input voltages and single output voltage is constructed with single VDDDA, two capacitors and two resistors. Its quality factor can be adjusted without affecting natural frequency. Also, the natural frequency can be electronically tuned via adjusting of bias current. The filter can offer five output responses, high-pas (HP), band-pass (BP), band-reject (BR), low-pass (LP) and allass (AP) functions in the same circuit topology. The output response can be selected by choosing the suitable input voltage without the component matching condition and the requirement of additional double gain voltage amplifier. PSpice simulation results to confirm an operation of the proposed filter correspond to the theory. 2 Circuit configuration and analysis of the proposed filter 2.1 VDDDA In order to understand the proposed filter, the brief details of the active building block, VDDDA are given in this section. The symbolic representation of VDDDA is shown in Fig. 1(a). It has five input voltage terminals, called as V+, V-, Z, P and N ports. The Z port is also the output current terminal and the W port is the output voltage. Ideally, the impedance at V+, V-, Z, P and N ports are assumed to be infinite while the impedance at W port exhibits low. The equivalent circuit is illustrated in Figure 1(b). In this design, the VDDDA is constructed from CMOS technology as illustrated in Figure 1(c). The idealization of VDDDA’s parameters implies that “where μ is the mobility of the carrier for NMOS transistors, M15 and M16 in Fig. 1(c), Cox is the gate oxide capacitance per unit area, W and L are the channel width and channel length, (...truncated)


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Amornchai Chaichana, Surasak Sangyaem, Winai Jaikla. Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier, MATEC Web of Conferences, 2017, pp. 14003, 95, DOI: 10.1051/matecconf/20179514003