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Questions tagged [input-impedance]

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253 questions
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4 answers
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I am trying to find the input resistance for the following circuit, but struggling to know where to even start: From general method of connecting a known voltage source to find the input current does ...
Guna's user avatar
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3 votes
1 answer
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In an op-amp (OPA838) the input impedance common-mode is as follows: What is the range for the input impedance? I want to interpret this: (35 || 1 MΩ || pF)
Andromeda's user avatar
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Datasheet The Smith chart on page 13 suggests complex input impedance: While at page 32 it clearly states: The LNA is a broadband gain block that increases the amplitude of a signal received from ...
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1 vote
1 answer
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A common noise model of a Photodiode amplifier is the following: (for example in https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/14/noise11_2D00_Photodiode_2D00_Noise-1....
Seppde's user avatar
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In the following diagram, I would like to know how to find out equivalent resistance seen from points A and B (input terminals of a differential ADC)? I'm trying to determine if the source signal has ...
Bee16's user avatar
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2 votes
1 answer
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I would like to ask if anyone could explain to me how to calculate the Input Impedance of a given circuit, if the OPA used is an Ideal one. The task is also to create a simplified schematic of this ...
gamemax23's user avatar
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2 answers
62 views

If the input impedance of a linear block A is Rin1 and that of block B is Rin2 while the other terminal is grounded as shown, is there a way to find out Rin3 when A and B are in series?
Azhagendharan's user avatar
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Trying to create diode in CST schematic but getting this error. Use same values and import it in CST as .lib file (notepad file names as .lib). Transmission lines used for impedance matching. ...
Abdalian's user avatar
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The following is from the book RF MICROELECTRONICS Page 56. Determine the noise figure of the circuit shown in Fig. 2.53(a). Neglect transistor capacitances, flicker noise, channel-length modulation, ...
kile's user avatar
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1 answer
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I have a dual output sensor connected to two analog inputs on a controller. The main output of the sensor works from 0.5 to 4.5 V DC and the other output is inverted such that it works from 4.5 to 0.5 ...
Russell Gunn's user avatar
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1 vote
1 answer
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I'm doing the practice problem pictured below: Find d1 and d2 with: $$Z_o = 50 \Omega \hspace{5mm} Z_L = 100 \Omega \hspace{5mm} f=10GHz$$ So that: $$Y_{in}=20\angle30^o\hspace{1mm}mS$$ I summed up ...
MXVG's user avatar
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I'm new to this forum and hope you can help me. I am in the process of designing an input filter for a DC-DC step-down converter 12V-5V/1A (Pic.1). I am trying to determine the transfer function and ...
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0 answers
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The following circuit is from Chapter 13 of Analog Design Essentials, page 1324, written by Willy Sansen. Calculate \$R_{in}\$ for this circuit. The author thinks \$R_{in} = 1 / g_m\$ However, $$ -...
kile's user avatar
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1 answer
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I designed an amplifier with an OPA838 as follows: First scenario: I want to connect the OPA838 to a next stage voltage LNA (Low Noise Amplifier). What components or circuit should I add to my output ...
Andromeda's user avatar
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1 answer
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I'm trying to control an opto-isolator (actually a photorelay such as a TLP354x but it doesn't really matter here). The problem lie in an external device (black magic box) which is also controlled by ...
VoltsAndNuts's user avatar
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