- Added utilities for frequency planning

- Changed freq plane to: Fs 4096, int/dec 8X, Mixers 768

utilities/plotspectrum.m

@@ -0,0 +1,58 @@
+function h = plotspectrum(type, centers, bandwidth, color, unit, varargin)
+
+
+for n = 1:numel(centers)
+    center = centers(n);
+    switch type
+    case 'sym'
+        x = [-1,  -1,   0,   1,   1] * (bandwidth/2) + center;
+        y = [ 0,  0.5,  1,  0.5,  0];
+    case 'asym'
+        x = [-1,  -1,   1,  1] * (bandwidth/2) + center;
+        y = [0,   0.5,  1,  0];
+    case 'asymflip'
+        x = [-1,  -1,   1,    1] * (bandwidth/2) + center;
+        y = [0,    1,   0.5,  0];
+    otherwise
+        error('Invalid type.');
+    end
+    switch unit
+    case 'Hz'
+        factor = 1;
+    case 'kHz'
+        factor = 1e3;
+    case 'MHz'
+        factor = 1e6;
+    case 'GHz'
+        factor = 1e9;
+    otherwise
+        error('Invalid unit');
+    end
+    tmp = patch(x/factor, y, color, varargin{:});
+    if n == 1
+        h = tmp;
+    else
+        h = [h, tmp];   %#ok<AGROW>
+    end
+end
+
+
+switch unit
+case 'Hz'
+    xlabel('Frequency (Hz)', 'FontWeight', 'bold')
+case 'kHz'
+    xlabel('Frequency (kHz)', 'FontWeight', 'bold')
+case 'MHz'
+    xlabel('Frequency (MHz)', 'FontWeight', 'bold')
+case 'GHz'
+    xlabel('Frequency (GHz)', 'FontWeight', 'bold')
+otherwise
+    error('Invalid unit');
+end
+a = gca;
+a.XAxis.FontWeight = 'bold';
+
+
+end
+
+