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university:courses:electronics:electronics-lab-active-mixer [29 Jul 2019 14:04] – Double balanced mixer with LTC1043 Pop Andreeauniversity:courses:electronics:electronics-lab-active-mixer [30 Jul 2019 08:21] – edited single bal Trecia Agoylo
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 ===== Materials ===== ===== Materials =====
 +ADALM2000 Active Learning Module\\
 +Solder-less breadboard, and jumper wire kit\\
 +2 1 kΩ resistor\\
 +2 6.8k kΩ resistor\\
 +1 OP37 precision op-amp\\
 +1 LTC1043 precision switched-cap block \\
 +3 N-channel MOSFET\\
  
 =====Single Balanced Active Mixer=====  =====Single Balanced Active Mixer=====
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 A single-balanced mixer often called a balanced mixer, is a type of mixer which suppresses either the LO or RF signal but not both. This configuration is hardly used because of its susceptibility to noise in the input LO signal. The main drawback is its IF-LO feed-through, which means the LO signal can leak into the IF signal if the IF signal frequency is not much lower than the LO signal frequency. Shown in Figure 3 is a simple circuit of a single balanced mixer. A single-balanced mixer often called a balanced mixer, is a type of mixer which suppresses either the LO or RF signal but not both. This configuration is hardly used because of its susceptibility to noise in the input LO signal. The main drawback is its IF-LO feed-through, which means the LO signal can leak into the IF signal if the IF signal frequency is not much lower than the LO signal frequency. Shown in Figure 3 is a simple circuit of a single balanced mixer.
  
-{{ :university:courses:electronics:singlebal_ckt.png?400 |}}+{{ :university:courses:electronics:singlebal_ckt.png?500 |}}
  
 <WRAP  centeralign> Figure 3. Single Balanced Mixer </WRAP> <WRAP  centeralign> Figure 3. Single Balanced Mixer </WRAP>
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 ====Hardware Setup==== ====Hardware Setup====
  
-Build the following breadboard connection shown in Figure 3.+Build the following breadboard connection shown in Figure 4.
  
 {{ :university:courses:electronics:singlebal_bb.png? |}} {{ :university:courses:electronics:singlebal_bb.png? |}}
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 ====Procedure==== ====Procedure====
  
-Use Signal Generator Ch1 and Ch1, W1 and W2, as the frequency inputs to the mixer.  +Use Signal Generator W1 and W2, as the frequency inputs to the mixer. For the LO frequency use W1, set it to 5V 210 kHz sine wave. For the RF input, use W2. 
-For the Up-conversion mixing, set Signal Generator Ch1 to 5V, 500kHz sine wave, this will serve as the LO frequency for this activity. Then, set Signal Generator Ch2 to 5V, 10kHz sine wave, this will serve as the IF input to the mixer. So, our expected output is at 490kHz and 510kHz and spectrum should be like Figure 2b. +For the Up-conversion mixing, W2 should be lower than the LO frequency so set W2 to 5V, 25 kHz sine wave. So, our expected output is at 185kHz and 235kHz. Analog Ch2 monitors the RF input, W2, whereas Ch1 monitors the IF output through the Spectrum Analyzer. The result is shown in Figure 5a.
-Probe Analog Ch1, 1+, to the LO frequency input to monitor in Spectrum Analyzer and Analog Ch2, 2+, to the output frequency. The result is shown in Figure 5a.+
  
-{{ :university:courses:electronics:singlebal_plot_upcon.png?700 |}}+{{ :university:courses:electronics:singlebal_plot_upcon.png?500 |}}
  
 <WRAP  centeralign> Figure 5a. Up-conversion Spectrum Plot </WRAP> <WRAP  centeralign> Figure 5a. Up-conversion Spectrum Plot </WRAP>
  
-For the Down-conversion mixing, set Signal Generator Ch1 to 5V, 500kHz sine wave, this will serve as the LO frequency for this activity. Then, set Signal Generator Ch2 to 5V, 490kHz sine wave, this will serve as the RF input to the mixer. So, our expected output is at 10kHz and spectrum should be like Figure 2a.+For the Down-conversion mixing, set W2 to 5V, 260kHz sine wave, this will serve as the RF input to the mixer. So, our expected output is at 50kHz and spectrum result should be like Figure 5b.
  
-{{ :university:courses:electronics:singlebal_plot_downcon.png?700 |}}+{{ :university:courses:electronics:singlebal_plot_downcon.png?500 |}}
  
 <WRAP  centeralign> Figure 5b. Down-conversion Spectrum Plot </WRAP> <WRAP  centeralign> Figure 5b. Down-conversion Spectrum Plot </WRAP>
 +
  
 ===== Single balanced active mixer implemented with LTC1043 ===== ===== Single balanced active mixer implemented with LTC1043 =====
university/courses/electronics/electronics-lab-active-mixer.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz

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