Zcu111ResmReceiver/docs/pl_tx_subsystem.md

📡 PL Tx Subsystem (Pulse Generator)

Overview

The Tx subsystem implements a pulse-based LFM chirp generator using a DDS/NCO architecture.

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Architecture

TxPulseStart → pulse_gen_ctrl → tx_active → NCO → Output

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Chirp Generation

Δφ[n] = Δφ[n−1] + step
φ[n] = φ[n−1] + Δφ[n]

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Parameterization

• Fc (center frequency)
• B (bandwidth)

Derived: f_start = Fc − B/2
step = B / (N − 1)

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Pulse Timing

|<------ PRI ------>| |<-- pulse -->| idle |

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Trigger

Controlled via TxPulseStart (from PS subsystem)

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🔗 Related Components

• PS Subsystem
• PL Rx Subsystem