tailieunhanh - Advances in Analog Circuits Part 4

Tham khảo tài liệu 'advances in analog circuits part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | New Port Modeling and Local Biasing of Analog Circuits 79 For a maximum of 7 V peak to peak output voltage swing M4 we need the DC power supplies Vdd Vss 5 V. The selection of the operating currents for the transistors is based on the power expectation for each stage. For example in the buffer stage the device current ID4 mA is selected to deliver about 5 mW power to the load. Likewise given the current gain for the buffer stage AI3 24 A A we can calculate the drain current for M3 as ID3 24 mA. The selection of VGS for M4 is important in pushing the operating region of the buffer transistor far enough into the linear saturation region and to produce Voutp-p 7 V without distortion. Other design parameters such as the resistor values are also calculated for the targeted performance of the amplifier. For this design we find RM1 51 KQ RM2 51 KQ and RM4 KQ to best fit the specs. Locally biasing Sources W L pm Vds Vgs Vsb Id pMOS-1 15 2 pA pMOS-2 15 2 pA nMOS-3 30 2 pA pMOS-4 500 2 mA Table VII. Transistor Sizes and DC sources for local biasings of Transistors 5 9 Fig. 30. The Op-Amp configuration with locally biased devices The initial stage of the design of the amplifier including the component biasing is over now. In the next stage we need to replace the transistors with their small signal models to perform the performance design such as the gains bandwidth and so on. However because our main intention at this point is the biasing design we ignore details on the performance design. Here we are allowed to modify the component values except for the transistors model values which are anchored by the local biasing until the desired responses are obtained and the design criteria are met. Following the performance design we need to replace the linear transistor models with their locally biased transistors as shown in Figure 30. Note that no external DC supply .

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