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university:courses:electronics:electronics-lab-active-mixer [30 Jul 2019 08:21] – edited single bal Trecia Agoylouniversity:courses:electronics:electronics-lab-active-mixer [30 Jul 2019 10:29] – Trecia Agoylo
Line 35: Line 35:
 1 OP37 precision op-amp\\ 1 OP37 precision op-amp\\
 1 LTC1043 precision switched-cap block \\ 1 LTC1043 precision switched-cap block \\
-3 N-channel MOSFET\\+3 N-channel MOSFET (2-ZVN3310, 1-ZVN2210A)\\
  
 =====Single Balanced Active Mixer=====  =====Single Balanced Active Mixer=====
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 <WRAP  centeralign> Figure 7.  Switching Mixer with LTC1043 </WRAP> <WRAP  centeralign> Figure 7.  Switching Mixer with LTC1043 </WRAP>
 In figure 7 is presented the circuit in LTSpice, but it can be implemented with hardware parts on a breadboard. In figure 7 is presented the circuit in LTSpice, but it can be implemented with hardware parts on a breadboard.
-We use the inputs of the first switch of the LT1043. The input signal will be generated on the channel 1 of the signal generator and connected to S1A. To obtain its inverted version we build a simple inverting amplifier with unity gain and connect it to S2A. The output is visualized at pin Ca+ with the channel 2+ of the oscilloscope. For a down-conversion mixer, Channel 1 of the signal generator must be set at a frequency higher than that of the oscillator, for example, 250kHz. The output will be the difference of the two frequencies, at 40kHz.+We use the inputs of the first switch of the LT1043. The input signal will be generated on channel 1 of the signal generator and connected to S1A. To obtain its inverted version we build a simple inverting amplifier with unity gain and connect it to S2A. The output is visualized at pin Ca+ with the channel 2+ of the oscilloscope. For a down-conversion mixer, Channel 1 of the signal generator must be set at a frequency higher than that of the oscillator, for example, 250kHz. The output will be the difference of the two frequencies, at 40kHz.
  
 {{ :university:courses:electronics:downconvfftnocap.png?600 |}} {{ :university:courses:electronics:downconvfftnocap.png?600 |}}
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 ===== Double balanced active mixer implemented with LTC1043 ===== ===== Double balanced active mixer implemented with LTC1043 =====
  
-The double balanced mixer configuration requires two single-balanced circuits. We can build this configuration with LTC1043 as it has many swithches and it provides the anti-paralell switching pair needed. In Figure 11 is presented the schematic of the circuit. The circuit and the connections are almost the same, only the inputs of the second switch(S3A S4A) are connected in reverse order to the inputs of the first switch (S1A S2A). In this case the output is visualized with oscilloscope channel 2+ at pin Ca+ and 2- at pin Ca-. +The double balanced mixer configuration requires two single-balanced circuits. We can build this configuration with LTC1043 as it has many swithches and it provides the anti-paralell switching pair needed. In Figure 11 is presented the schematic of the circuit. The circuit and the connections are almost the same, only the inputs of the second switch(S3A S4A) are connected in reverse order to the inputs of the first switch (S1A S2A). In this case, the output is visualized with oscilloscope channel 2+ at pin Ca+ and 2- at pin Ca-. 
 {{ :university:courses:electronics:doublebalanced_ltc1043.png?700 |}} {{ :university:courses:electronics:doublebalanced_ltc1043.png?700 |}}
 <WRAP  centeralign> Figure 11. Double balanced mixer with LTC1043</WRAP> <WRAP  centeralign> Figure 11. Double balanced mixer with LTC1043</WRAP>
-To analyze the Down-conversion configuration on the channel 1 of the signal generator is generated a sinewave with 250kHz frequency and 1V amplitude. In Figure 12 is presented the resulting FFT analysis. +To analyze the Down-conversion configuration on channel 1 of the signal generator is generated a sinewave with 250kHz frequency and 1V amplitude. In Figure 12 is presented the resulting FFT analysis. 
 {{ :university:courses:electronics:downconvdouble_250k.png?600 |}} {{ :university:courses:electronics:downconvdouble_250k.png?600 |}}
 <WRAP  centeralign> Figure 12. Down-conversion FFT analysis</WRAP> <WRAP  centeralign> Figure 12. Down-conversion FFT analysis</WRAP>
  
-For Up-conversion the sinewave generated on the channel 1 will have a frequency smaller than that of the LTC1043 internal oscillator, for example 50kHz. The FFT analysis for this frequency value is seen in Figure 13.+For Up-conversion the sinewave generated on channel 1 will have a frequency smaller than that of the LTC1043 internal oscillator, for example, 50kHz. The FFT analysis for this frequency value is seen in Figure 13.
 {{ :university:courses:electronics:upconvdoube_50k.png?600 |}} {{ :university:courses:electronics:upconvdoube_50k.png?600 |}}
 <WRAP  centeralign> Figure 13. Up-conversion FFT analysis</WRAP> <WRAP  centeralign> Figure 13. Up-conversion FFT analysis</WRAP>
university/courses/electronics/electronics-lab-active-mixer.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz

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