Interface Guide: PDRO Series Phase-Locked DRO Oscillators

Overview

The BRIDZA PDRO series phase-locked dielectric resonator oscillators provide ultra-low phase noise microwave signals for radar, test equipment, and communications systems. Available in multiple frequency bands from 8-18GHz, these oscillators achieve phase noise performance exceeding -110dBc/Hz at 10kHz offset.

Supported Models

Model	Frequency Range	Output Power	Phase Noise @ 10kHz
-------	---------------	--------------	---------------------
PDRO50-12	8-12GHz	+15dBm min	≤-100dBc/Hz
PDRO50-18	12-18GHz	+15dBm min	≤-98dBc/Hz
PDRO57-12	8-12GHz	+18dBm min	≤-102dBc/Hz
PDRO57-18	12-18GHz	+18dBm min	≤-100dBc/Hz

Front Panel Layout

 ┌────────────────────────────────────────────────────────────────┐
 │ BRIDZA PDRO50-18 PHASE-LOCKED DRO │
 │ │
 │ ┌──────┐ ┌──────┐ ┌──────┐ │
 │ │ PWR │ │ LOCK │ │ REF │ │
 │ │ ● │ │ ● │ │ ○ │ │
 │ └──────┘ └──────┘ └──────┘ │
 │ │
 │ OUTPUT │
 │ ┌────────┐ │
 │ │ RF │ │
 │ │ OUT │ │
 │ └───○────┘ │
 │ Kconnector (SMA compatible) │
 │ │
 │ ┌──────────────────────────────────────────────────────────┐ │
 │ │ REF IN DC INPUT LOCK OUT │ │
 │ │ ┌────┐ ┌────┐ ┌────┐ │ │
 │ │ │SMA │ │ ○- │ │SMA │ │ │
 │ │ └────┘ └────┘ └────┘ │ │
 │ └──────────────────────────────────────────────────────────┘ │
 │ │
 │ FREQ: 13.456 GHz PWR: +17.2 dBm │
 └────────────────────────────────────────────────────────────────┘

Interface Definitions

1. RF Reference Input (10MHz)

Parameter	Specification
-----------	---------------
Connector	SMA female
Frequency	10MHz (standard)
Input Level	-3 to +10dBm
Impedance	50Ω
Lock Range	±1kHz
Input Protection	±10V maximum

2. RF Output

Parameter	PDRO50	PDRO57
-----------	---------	--------
Connector	SMA female	SMA female
Frequency Range	8-12GHz / 12-18GHz	8-12GHz / 12-18GHz
Output Power	+15dBm min	+18dBm min
Power Stability	±0.5dB	±0.5dB
Harmonics	≤-30dBc	≤-30dBc
Spurious	≤-70dBc	≤-70dBc

3. Lock Indicator Output

Parameter	Specification
-----------	---------------
Connector	SMA female
Signal	TTL level
Level	High = Locked, Low = Unlocked
Impedance	50Ω

4. Power Supply

Parameter	Specification
-----------	---------------
Voltage	+12VDC or +15VDC
Current	<2A
Power	<25W
Connector	5.5×2.1mm DC jack or terminal block

Pin Assignment:

 ┌─────────────────────┐
 │ + - NC │
 │ │ │ │ │
 │ 12V GND Chassis │
 └─────────────────────┘

Phase Noise Performance

Offset	PDRO50-18	PDRO57-18
--------	-----------	-----------
100Hz	-70dBc/Hz	-72dBc/Hz
1kHz	-85dBc/Hz	-88dBc/Hz
10kHz	-98dBc/Hz	-100dBc/Hz
100kHz	-110dBc/Hz	-112dBc/Hz
1MHz	-130dBc/Hz	-132dBc/Hz

Mechanical Dimensions

 Standard Module:
 ┌─────────────────────────────────┐
 │ │ 40mm
 │ PDRO50-18 │
 │ │
 │ [RF OUT] [LOCK] [REF] │
 │ │
 └─────────────────────────────────┘
 └── 80mm ──┘
 
 Mounting: 4× M2.5 screws
 Heat sink: Integrated base plate

Thermal Management

Parameter	Specification
-----------	---------------
Operating Temp	-40°C to +70°C
Storage Temp	-55°C to +85°C
Cooling	Conduction to base plate
Heat Sink	Required for full performance

Mounting Recommendation:

 ┌─────────────────────────────────┐
 │ Heat Sink / Chassis │
 │ ═══════════════════════════ │
 │ │
 │ ┌─────────────────────────┐ │
 │ │ Thermal Compound │ │
 │ │ (Thermal Grizzly or eq) │ │
 │ └─────────────────────────┘ │
 │ │
 │ ┌─────────────────────────┐ │
 │ │ PDRO Module │ │
 │ └─────────────────────────┘ │
 │ │
 └─────────────────────────────────┘

Typical Application

 ┌────────────────────────────────────────────────────────────────┐
 │ RADAR SYSTEM LOOP │
 │ │
 │ ┌──────────┐ │
 │ │ 10MHz │ │
 │ │ Reference│ │
 │ └────┬─────┘ │
 │ │ │
 │ ▼ │
 │ ┌──────────┐ │
 │ │ PDRO │ RF OUTPUT │
 │ │ 13GHz │────────────┐ │
 │ └────┬─────┘ │ │
 │ │ │ │
 │ │ Reference │ Radar TX/RX │
 │ │ │ │
 │ ▼ ▼ │
 │ ┌──────────┐ ┌──────────┐ │
 │ │ Power │ │ Mixer │ │
 │ │ Detector│ │ │ │
 │ └────┬─────┘ └────┬─────┘ │
 │ │ │ │
 │ └────────┬─────────┘ │
 │ │ │
 │ ▼ │
 │ ┌──────────┐ │
 │ │ PLL │ │
 │ │ Control │ │
 │ └──────────┘ │
 │ │
 └────────────────────────────────────────────────────────────────┘

Troubleshooting

Symptom	Cause	Solution
---------	-------	----------
LOCK LED off	Reference missing	Check 10MHz input
-	Reference unlocked	Verify reference quality
Low output power	Thermal limit	Improve cooling
-	Input level low	Increase reference level
Phase noise degraded	Thermal noise	Check temperature
-	Reference noise	Use cleaner reference
Frequency drift	Warm-up	Allow 30 min warm-up
-	Thermal variation	Stabilize mounting

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Document Version: 1.0

Last Updated: 2026-05-24

BRIDZA Technologies