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! scope="row"| E1
| Voltage-Controlled Voltage-Dependent Source
| Defaults, gain = 1e-4, controlled by v(3,0)
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! scope="row"| A3
| Gain Block(must be made unique)
| Defaults, gain = 50
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In this part of the tutorial lesson, you will build and test an FMCW system with a sawtooth chirp modulation. [[RF.Spice A/D]] provides three types of chirp generator devices. All three are based on sawtooth modulation but each provides a different output waveform. They are sinusoidal chirp generator, triangular wave chirp generator and square wave chirp generator. For this project, you will use the first type, which can be access from '''Menu > Parts > Waveform Generation Blocks > Chirp Generators > Sine Wave Chirp Generator'''. Set the '''Chirp Period''' to 100μs (i.e. a 10kHz chirp), and set the values of the two [[parameters]] '''freq_low''' and '''freq_high''' to 1GHz and 1.01GHz, respectively. Therefore, B = 1.01GHz - 1GHz = 10MHz.
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Place and connect all the parts as shown in the figure below. The signal of the chirp generator is split into two equal parts using an '''Ideal Splitter Block''', one of which goes to a 50Ω matched antenna load called RL. The received signal at the receiver antenna is modeled here using a voltage-controlled voltage source (VCVS) E1, which is dependent on the voltage at Node 3. i.e. the antenna load, with a proportionality constant of 1e-4. The highly attenuated signal also goes through an '''Ideal Delay Block''' with a specified delay of 10μs. In other words, Node 5 represents the receive antenna, or the receiver's entry point. The received signal is amplified at the low-noise amplifier (LNA), which is modeled by a '''Gain Block''' A1 with a gain of 5000. This signal is then mixed with the other half of the transmitted signal using the '''Multiplier Block''' A2. The down-converted signal is amplified once more by A3 with a gain of 50 and is passed through a generic lowpass filter block with a cutoff frequency of 2MHz.
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[[File:SysTUT7 14.png|thumb|750px|The schematic of the QAM Demodulator FMCW radar transmitter-receiver circuitusing sawtooth chirp modulation.]]
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! scope="row"| Stop Time
| 25n25u
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! scope="row"| Linearize Step
| 10p50p
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! scope="row"| Step Ceiling
| 10p50p
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! scope="row"| Preset Graph Plots