Switched Capacitor Biquad Filter Using CDTA

• 作者: Indu Prabha Singh Kalyan Singh Meeti Dehran Rabindra Kumar Singh
• 来源期刊: 电路与系统(英文)
• 学科: 工学
• 关键词: Current Differencing TRANSCONDUCTANCE AMPLIFIER (CDTA) Biquad FILTER CURRENT-MODE CIRCUIT
• 年，卷（期）: 2013,（6）
• 页码范围: 438-442
• 页数: 5页
• 分类号: TN7

摘要

A switched capacitor biquad filter using current differencing transconductance amplifier (CDTA) is presented in this paper. The proposed circuit employs only one CDTA, two virtually grounded capacitors and one switched capacitor. It is a resistorless circuit, so it is beneficial to IC implementation in terms of space consideration. The proposed circuit is a second order single input multiple output (SIMO) current-mode filter. This filter can simultaneously realize all basic filter functions high pass, low pass and band pass responses without any component-matching conditions. All the active and passive sensitivities are low. The natural angular frequency (ω0) and quality factor (Q) of proposed filter can be electronically controlled. Owing to current mode operation it consumes less power. PSPICE simulation results are used to verify the theoretical analysis.