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• 1. RC Filters

  RC 필터 회로를 설계하고 주파수 특성을 분석하였습니다. Low-pass 필터와 High-pass 필터의 동작 원리를 이해하고, 수식을 통해 cut-off 주파수를 계산하였습니다. 또한 Bode plot을 그리고 AC 시뮬레이션을 수행하여 주파수 특성을 확인하였습니다. Transient 시뮬레이션을 통해 입력 신호에 따른 출력 파형을 분석하였습니다.

• 2. Common-source amplifier 1

  Common-source 증폭기 회로를 설계하였습니다. 원하는 이득을 얻도록 트랜지스터 사이즈와 저항값을 결정하였고, Transient 및 AC 시뮬레이션을 수행하여 회로의 동작을 확인하였습니다. 입력 신호 크기에 따른 출력 파형의 변화도 분석하였습니다.

• 3. Common-source amplifier 2

  Common-source 증폭기 회로에 AC 커플링 및 부하 저항을 추가하여 회로를 구현하였습니다. Transient 시뮬레이션을 통해 입력과 출력 파형을 비교하고, 부하 저항 값에 따른 출력 변화를 분석하였습니다.

• 4. Current mirror

  Current mirror 회로를 설계하였습니다. 이상적인 전류원과 트랜지스터 사이즈를 결정하고, Transient 시뮬레이션을 통해 두 NMOS의 드레인 전류를 비교하였습니다. 트랜지스터 사이즈 변경 및 저항 변경에 따른 영향을 분석하였습니다.

• 5. Common-source amplifier with source follower

  Common-source 증폭기에 Source Follower 회로를 추가하여 버퍼 회로를 구현하였습니다. Transient 시뮬레이션을 통해 입력과 출력 파형을 확인하고, 입력 신호 크기에 따른 출력 변화를 분석하였습니다.

• 6. Differential Amplifier

  차동 증폭기 회로를 설계하였습니다. 원하는 전압 이득을 얻도록 트랜지스터 사이즈와 전류를 결정하였고, AC 및 Transient 시뮬레이션을 수행하여 회로의 주파수 특성과 동작을 확인하였습니다. 또한 이상적인 전류원을 Current Mirror로 구현하여 회로를 개선하였습니다.

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• 1. RC Filters

  RC filters are fundamental building blocks in electronic circuits, used to filter out unwanted frequencies and signals. They consist of a resistor (R) and a capacitor (C) connected in series or parallel, forming a low-pass, high-pass, or band-pass filter. The combination of the resistance and capacitance determines the cutoff frequency, which is the frequency at which the signal is attenuated by 3 dB. RC filters are widely used in audio, radio, and power supply circuits to remove unwanted noise and harmonics. They are simple, inexpensive, and can be easily designed and implemented, making them a versatile and essential component in many electronic systems.

• 2. Common-source amplifier 1

  The common-source amplifier is a fundamental analog circuit topology that uses a field-effect transistor (FET) as the active device. In this configuration, the source terminal is connected to ground, the gate terminal receives the input signal, and the drain terminal provides the amplified output. The common-source amplifier offers several advantages, including high input impedance, moderate voltage gain, and the ability to operate as a voltage amplifier. It is widely used in various analog circuits, such as audio amplifiers, radio frequency (RF) amplifiers, and operational amplifier (op-amp) input stages. Understanding the principles and characteristics of the common-source amplifier is crucial for designing and analyzing a wide range of analog electronic circuits.

• 3. Common-source amplifier 2

  The common-source amplifier is a versatile and widely used analog circuit topology that builds upon the basic principles of the first common-source amplifier. In this second iteration, the common-source amplifier may incorporate additional features or modifications to enhance its performance and functionality. For example, it could include a source degeneration resistor to improve the linearity and stability of the amplifier, or a current source load to provide a higher output impedance and voltage gain. Additionally, the common-source amplifier can be combined with other circuit elements, such as a common-drain (source follower) stage, to create more complex amplifier configurations. Understanding the various implementations and design considerations of the common-source amplifier is essential for analog circuit design, as it forms the foundation for many advanced analog circuits and systems.

• 4. Current mirror

  The current mirror is a fundamental analog circuit building block that is used to generate a copy or replica of a reference current. It consists of two or more transistors, typically connected in a specific configuration, where the current flowing through one transistor (the reference transistor) is mirrored or replicated in the other transistor(s). Current mirrors are widely used in analog and mixed-signal circuits, such as operational amplifiers, voltage regulators, and analog-to-digital converters, to provide biasing, current sources, and current sinks. They offer several advantages, including high input impedance, low output impedance, and the ability to scale or mirror currents. Understanding the principles and design of current mirrors is crucial for the development of efficient and reliable analog circuits.

• 5. Common-source amplifier with source follower

  The common-source amplifier with a source follower is a more complex analog circuit topology that combines the characteristics of the common-source amplifier and the source follower (common-drain amplifier). In this configuration, the common-source amplifier stage provides voltage gain, while the source follower stage acts as a buffer, providing a low output impedance and unity voltage gain. This combination offers several advantages, such as high input impedance, moderate voltage gain, and low output impedance, making it suitable for a wide range of applications, including audio amplifiers, buffer stages, and impedance matching circuits. The design and analysis of this amplifier configuration require a deeper understanding of transistor-based analog circuits and the interactions between the different stages. Mastering the common-source amplifier with a source follower is an important step in the development of more sophisticated analog electronic systems.

• 6. Differential Amplifier

  The differential amplifier is a fundamental analog circuit that amplifies the difference between two input signals while rejecting common-mode signals. It is a crucial building block in many analog and mixed-signal circuits, such as operational amplifiers, instrumentation amplifiers, and analog-to-digital converters. The differential amplifier offers several advantages, including high input impedance, high common-mode rejection ratio (CMRR), and the ability to amplify small differential signals while suppressing unwanted common-mode noise. Understanding the principles of differential amplifiers, including their design, analysis, and practical implementation, is essential for the development of high-performance analog circuits and systems. Mastering the differential amplifier concept is a crucial step in the journey of analog circuit design and analysis.