ADL8113 Driver

Overview

The ADL8113 is a 10MHz to 12GHz Low Noise Amplifier with integrated bypass switches. This driver provides digital control over the amplifier mode selection and enable/disable functionality.

The device features:

• Low noise amplifier: 10MHz to 12GHz operation

• Bypass switches: 10MHz to 14GHz operation

• Noise figure: 3.8dB

• Small signal gain: 14.0dB

• Output 3rd order intercept point (OIP3): 35.5dBm

• Digital control interface via GPIO pins

Digital Control Interface

The ADL8113 uses two GPIO control pins:

• VA: Mode control pin A

• VB: Mode control pin B

Operation Modes

The ADL8113 supports four operation modes controlled by VA and VB pins:

• Internal Amplifier: VA=0, VB=0 - Signal passes through the internal low noise amplifier

• Internal Bypass: VA=1, VB=1 - Signal bypasses through internal bypass path

• External Bypass A: VA=0, VB=1 - Signal routes through external bypass path A

• External Bypass B: VA=1, VB=0 - Signal routes through external bypass path B

API Functions

Initialization

int adl8113_init(struct adl8113_dev **device, struct adl8113_init_param *init_param)

Initialize the device and configure GPIO pins. Set initial mode as specified in init parameters.

Mode Control

int adl8113_set_mode(struct adl8113_dev *dev, enum adl8113_mode mode)

Set operation mode to ADL8113_INTERNAL_AMPLIFIER, ADL8113_INTERNAL_BYPASS, ADL8113_EXTERNAL_BYPASS_A, or ADL8113_EXTERNAL_BYPASS_B.

int adl8113_get_mode(struct adl8113_dev *dev, enum adl8113_mode *mode)

Get current operation mode.

Cleanup

int adl8113_remove(struct adl8113_dev *dev)

Free resources allocated during initialization.

Usage Example

struct adl8113_dev *dev;
struct adl8113_init_param init_param = {
    .gpio_va = { /* VA GPIO configuration */ },
    .gpio_vb = { /* VB GPIO configuration */ },
    .initial_mode = ADL8113_INTERNAL_AMPLIFIER
};

// Initialize the device
ret = adl8113_init(&dev, &init_param);
if (ret)
    return ret;

// Switch to external bypass A mode
ret = adl8113_set_mode(dev, ADL8113_EXTERNAL_BYPASS_A);
if (ret)
    goto cleanup;

cleanup:
adl8113_remove(dev);

Dependencies

• no_os_gpio.h

• no_os_error.h

• no_os_alloc.h

ADL8113 no-OS IIO support

The ADL8113 IIO driver comes on top of the ADL8113 driver and offers support for interfacing IIO clients through libiio.

ADL8113 IIO Device Configuration

Device Attributes

The ADL8113 IIO device does not have any device specific attributes.

Device Channels

The ADL8113 IIO device has 1 input channel:

• Channel 0: voltage0

Channel Attributes

The voltage0 channel has the following attribute:

• hardwaregain - The gain value corresponding to the current signal path. Writing a valid gain value selects the corresponding mode/path.

External Bypass Configuration

By default, only internal amplifier (14 dB) and internal bypass (-2 dB) modes are enabled. To enable external bypass paths, configure the init parameters:

adl8113_iio_ip.has_external_bypass_a = true;
adl8113_iio_ip.external_bypass_a_gain_db = 0;  // Set gain for external path A

adl8113_iio_ip.has_external_bypass_b = true;
adl8113_iio_ip.external_bypass_b_gain_db = 0;  // Set gain for external path B

ADL8113 IIO Driver Initialization Example

struct adl8113_iio_dev *adl8113_iio_desc;
struct adl8113_iio_init_param adl8113_iio_ip;

adl8113_iio_ip.adl8113_init_param = &adl8113_param;
adl8113_iio_ip.has_external_bypass_a = false;
adl8113_iio_ip.has_external_bypass_b = false;

ret = adl8113_iio_init(&adl8113_iio_desc, &adl8113_iio_ip);
if (ret)
    return ret;

struct iio_app_device iio_devices[] = {
    {
        .name = "adl8113",
        .dev = adl8113_iio_desc,
        .dev_descriptor = adl8113_iio_desc->iio_dev,
        .read_buff = NULL,
        .write_buff = NULL,
    },
};

struct iio_app_desc *app;
struct iio_app_init_param app_init_param = { 0 };

app_init_param.devices = iio_devices;
app_init_param.nb_devices = NO_OS_ARRAY_SIZE(iio_devices);
app_init_param.uart_init_params = uart_ip;

ret = iio_app_init(&app, app_init_param);
if (ret)
    return ret;

return iio_app_run(app);