Power Amp for Bluetooth Transmitter

[Vasiliy]

Hi all.

I'm working on a student project. The aim is to design and test a Class E power amp to be used in Bluetooth transmitters.
I have a few questions on the topic:

1) BT transmitter should be able to hop between 80 channels spaced 1MHz apart. There is allowed level of interference between neighboring channels. How this requirement satisfied? Is there a variable filter at the output of the power amp?
2) What is the common topology for output impedance matching network? I've seen a series capacitor and an inductor in parallel. Is assuming 50 Ohm for the antenna is Ok?
3) Output power control: class 1 BT transmitters must provide a mean of controlling its output power. What is the common approach for implementing this control? Changing Vdd?

Thanks to everyone in advance.

[NiHaoMike]

There are lots of chips that do exactly what you want. Just beware that the packages they come in are difficult to solder unless you have solder paste and a heat gun.
http://www.maxim-ic.com/datasheet/index.mvp/id/2458

[Vasiliy]

Thanks NiHaoMike, but it's not what I need.
There is no intent for this design to be implemented, it is just an educational project. The reference you've provided is a linear PA, which assumes that the input signal is properly filtered and shaped RF signal. The PA I want to design is switched mode (not linear). Its input signal is properly  modulated (GFSK) square wave, which is assumed to be an output of Bluetooth transmitter's modulation circuitry. Once fed into non-linear amplifier this signal gets distorted, therefore filtering is required.
When designing non-linear PA for a single center freq the filter may be as simple as a single LC tank, but in case of Bluetooth transmitter there are 80 different channels which should be supported, therefore there should be a mean of controlling the center frequency of the output signal.
It seems to me that a possible approach would be to implement a digitally controlled filter at the output of the PA, instead of a constant filter. The questions are:
1) Is variable filter really a way this issue resolved in the real designs?
2) What is the topology of this kind of variable filter?

Additional question:
3) What is the common topology of impedance matching network for this kind of designs?

Thank you.